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  • 16 files changed
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View
5 milkymist/minimac3/__init__.py
@@ -26,7 +26,8 @@ def __init__(self, address):
self._rx_count_0 = RegisterField("rx_count_0", _count_width, access_bus=READ_ONLY, access_dev=WRITE_ONLY)
self._rx_count_1 = RegisterField("rx_count_1", _count_width, access_bus=READ_ONLY, access_dev=WRITE_ONLY)
self._tx_count = RegisterField("tx_count", _count_width, access_dev=READ_WRITE)
- regs = [self._phy_reset, self._rx_count_0, self._rx_count_1, self._tx_count]
+ self._tx_start = RegisterField("tx_start", access_bus=WRITE_ONLY)
+ regs = [self._phy_reset, self._rx_count_0, self._rx_count_1, self._tx_count, self._tx_start]
self._rx_event_0 = EventSourcePulse()
self._rx_event_1 = EventSourcePulse()
@@ -78,7 +79,7 @@ def get_fragment(self):
("rx_ready_0", rx_ready_0),
("rx_ready_1", rx_ready_1),
- ("tx_start", self._tx_count.re),
+ ("tx_start", self._tx_start.re),
("tx_count", self._tx_count.field.r),
("wb_adr_i", self.membus.adr),
View
2  software/bios/Makefile
@@ -1,7 +1,7 @@
M2DIR=../..
include $(M2DIR)/software/include.mak
-OBJECTS=crt0.o isr.o ddrinit.o main.o
+OBJECTS=crt0.o isr.o ddrinit.o timer.o main.o microudp.o tftp.o boot-helper.o boot.o
all: bios.bin
View
10 software/bios/boot-helper.S
@@ -0,0 +1,10 @@
+.section .text, "ax", @progbits
+.global boot_helper
+boot_helper:
+ /* Invalidate instruction cache */
+ wcsr ICC, r0
+ nop
+ nop
+ nop
+ nop
+ call r5
View
284 software/bios/boot.c
@@ -0,0 +1,284 @@
+/*
+ * Milkymist SoC (Software)
+ * Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012 Sebastien Bourdeauducq
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdio.h>
+#include <console.h>
+#include <uart.h>
+#include <system.h>
+#include <board.h>
+#include <extra/crc.h>
+#include <sfl.h>
+#include <string.h>
+#include <irq.h>
+
+#include <hw/flash.h>
+#include <hw/mem.h>
+
+#include "timer.h"
+#include "microudp.h"
+#include "tftp.h"
+#include "boot.h"
+
+extern int rescue;
+extern void boot_helper(unsigned int r1, unsigned int r2, unsigned int r3, unsigned int r4, unsigned int addr);
+
+static void __attribute__((noreturn)) boot(unsigned int r1, unsigned int r2, unsigned int r3, unsigned int r4, unsigned int addr)
+{
+ printf("Executing booted program.\n");
+ uart_sync();
+ irq_setmask(0);
+ irq_setie(0);
+ boot_helper(r1, r2, r3, r4, addr);
+ while(1);
+}
+
+static int check_ack(void)
+{
+ int recognized;
+ static const char str[SFL_MAGIC_LEN] = SFL_MAGIC_ACK;
+
+ timer_enable(0);
+ timer_set_reload(0);
+ timer_set_counter(get_system_frequency()/4);
+ timer_enable(1);
+ recognized = 0;
+ while(timer_get()) {
+ if(uart_read_nonblock()) {
+ char c;
+ c = uart_read();
+ if(c == str[recognized]) {
+ recognized++;
+ if(recognized == SFL_MAGIC_LEN)
+ return 1;
+ } else {
+ if(c == str[0])
+ recognized = 1;
+ else
+ recognized = 0;
+ }
+ }
+ }
+ return 0;
+}
+
+#define MAX_FAILED 5
+
+void serialboot(void)
+{
+ struct sfl_frame frame;
+ int failed;
+ unsigned int cmdline_adr, initrdstart_adr, initrdend_adr;
+ static const char str[SFL_MAGIC_LEN+1] = SFL_MAGIC_REQ;
+ const char *c;
+
+ printf("Booting from serial...\n");
+
+ c = str;
+ while(*c) {
+ uart_write(*c);
+ c++;
+ }
+ if(!check_ack()) {
+ printf("Timeout\n");
+ return;
+ }
+
+ failed = 0;
+ cmdline_adr = initrdstart_adr = initrdend_adr = 0;
+ while(1) {
+ int i;
+ int actualcrc;
+ int goodcrc;
+
+ /* Grab one frame */
+ frame.length = uart_read();
+ frame.crc[0] = uart_read();
+ frame.crc[1] = uart_read();
+ frame.cmd = uart_read();
+ for(i=0;i<frame.length;i++)
+ frame.payload[i] = uart_read();
+
+ /* Check CRC */
+ actualcrc = ((int)frame.crc[0] << 8)|(int)frame.crc[1];
+ goodcrc = crc16(&frame.cmd, frame.length+1);
+ if(actualcrc != goodcrc) {
+ failed++;
+ if(failed == MAX_FAILED) {
+ printf("Too many consecutive errors, aborting");
+ return;
+ }
+ uart_write(SFL_ACK_CRCERROR);
+ continue;
+ }
+
+ /* CRC OK */
+ switch(frame.cmd) {
+ case SFL_CMD_ABORT:
+ failed = 0;
+ uart_write(SFL_ACK_SUCCESS);
+ return;
+ case SFL_CMD_LOAD: {
+ char *writepointer;
+
+ failed = 0;
+ writepointer = (char *)(
+ ((unsigned int)frame.payload[0] << 24)
+ |((unsigned int)frame.payload[1] << 16)
+ |((unsigned int)frame.payload[2] << 8)
+ |((unsigned int)frame.payload[3] << 0));
+ for(i=4;i<frame.length;i++)
+ *(writepointer++) = frame.payload[i];
+ uart_write(SFL_ACK_SUCCESS);
+ break;
+ }
+ case SFL_CMD_JUMP: {
+ unsigned int addr;
+
+ failed = 0;
+ addr = ((unsigned int)frame.payload[0] << 24)
+ |((unsigned int)frame.payload[1] << 16)
+ |((unsigned int)frame.payload[2] << 8)
+ |((unsigned int)frame.payload[3] << 0);
+ uart_write(SFL_ACK_SUCCESS);
+ boot(cmdline_adr, initrdstart_adr, initrdend_adr, rescue, addr);
+ break;
+ }
+ case SFL_CMD_CMDLINE:
+ failed = 0;
+ cmdline_adr = ((unsigned int)frame.payload[0] << 24)
+ |((unsigned int)frame.payload[1] << 16)
+ |((unsigned int)frame.payload[2] << 8)
+ |((unsigned int)frame.payload[3] << 0);
+ uart_write(SFL_ACK_SUCCESS);
+ break;
+ case SFL_CMD_INITRDSTART:
+ failed = 0;
+ initrdstart_adr = ((unsigned int)frame.payload[0] << 24)
+ |((unsigned int)frame.payload[1] << 16)
+ |((unsigned int)frame.payload[2] << 8)
+ |((unsigned int)frame.payload[3] << 0);
+ uart_write(SFL_ACK_SUCCESS);
+ break;
+ case SFL_CMD_INITRDEND:
+ failed = 0;
+ initrdend_adr = ((unsigned int)frame.payload[0] << 24)
+ |((unsigned int)frame.payload[1] << 16)
+ |((unsigned int)frame.payload[2] << 8)
+ |((unsigned int)frame.payload[3] << 0);
+ uart_write(SFL_ACK_SUCCESS);
+ break;
+ default:
+ failed++;
+ if(failed == MAX_FAILED) {
+ printf("Too many consecutive errors, aborting");
+ return;
+ }
+ uart_write(SFL_ACK_UNKNOWN);
+ break;
+ }
+ }
+}
+
+#define LOCALIP1 192
+#define LOCALIP2 168
+#define LOCALIP3 0
+#define LOCALIP4 42
+#define REMOTEIP1 192
+#define REMOTEIP2 168
+#define REMOTEIP3 0
+#define REMOTEIP4 14
+
+static int tftp_get_v(unsigned int ip, const char *filename, char *buffer)
+{
+ int r;
+
+ r = tftp_get(ip, filename, buffer);
+ if(r > 0)
+ printf("Successfully downloaded %d bytes from %s over TFTP\n", r, filename);
+ else
+ printf("Unable to download %s over TFTP\n", filename);
+ return r;
+}
+
+void netboot(void)
+{
+ int size;
+ unsigned int cmdline_adr, initrdstart_adr, initrdend_adr;
+ unsigned int ip;
+ unsigned char *macadr = (unsigned char *)FLASH_OFFSET_MAC_ADDRESS;
+
+ printf("Booting from network...\n");
+ printf("Local IP : %d.%d.%d.%d\n", LOCALIP1, LOCALIP2, LOCALIP3, LOCALIP4);
+ printf("Remote IP: %d.%d.%d.%d\n", REMOTEIP1, REMOTEIP2, REMOTEIP3, REMOTEIP4);
+
+ ip = IPTOINT(REMOTEIP1, REMOTEIP2, REMOTEIP3, REMOTEIP4);
+
+ microudp_start(macadr, IPTOINT(LOCALIP1, LOCALIP2, LOCALIP3, LOCALIP4));
+
+ if(tftp_get_v(ip, "boot.bin", (void *)SDRAM_BASE) <= 0) {
+ printf("Network boot failed\n");
+ return;
+ }
+
+ cmdline_adr = SDRAM_BASE+0x1000000;
+ size = tftp_get_v(ip, "cmdline.txt", (void *)cmdline_adr);
+ if(size <= 0) {
+ printf("No command line parameters found\n");
+ cmdline_adr = 0;
+ } else
+ *((char *)(cmdline_adr+size)) = 0x00;
+
+ initrdstart_adr = SDRAM_BASE+0x1002000;
+ size = tftp_get_v(ip, "initrd.bin", (void *)initrdstart_adr);
+ if(size <= 0) {
+ printf("No initial ramdisk found\n");
+ initrdstart_adr = 0;
+ initrdend_adr = 0;
+ } else
+ initrdend_adr = initrdstart_adr + size;
+
+ boot(cmdline_adr, initrdstart_adr, initrdend_adr, rescue, SDRAM_BASE);
+}
+
+void flashboot(void)
+{
+ unsigned int *flashbase;
+ unsigned int length;
+ unsigned int crc;
+ unsigned int got_crc;
+
+ printf("Booting from flash...\n");
+ if(rescue)
+ flashbase = (unsigned int *)FLASH_OFFSET_RESCUE_APP;
+ else
+ flashbase = (unsigned int *)FLASH_OFFSET_REGULAR_APP;
+ length = *flashbase++;
+ crc = *flashbase++;
+ if((length < 32) || (length > 4*1024*1024)) {
+ printf("Error: Invalid flash boot image length\n");
+ return;
+ }
+
+ printf("Loading %d bytes from flash...\n", length);
+ memcpy((void *)SDRAM_BASE, flashbase, length);
+ got_crc = crc32((unsigned char *)SDRAM_BASE, length);
+ if(crc != got_crc) {
+ printf("CRC failed (expected %08x, got %08x)\n", crc, got_crc);
+ return;
+ }
+ boot(0, 0, 0, rescue, SDRAM_BASE);
+}
View
25 software/bios/boot.h
@@ -0,0 +1,25 @@
+/*
+ * Milkymist SoC (Software)
+ * Copyright (C) 2007, 2008, 2009, 2010, 2012 Sebastien Bourdeauducq
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __BOOT_H
+#define __BOOT_H
+
+void serialboot(void);
+void netboot(void);
+void flashboot(void);
+
+#endif /* __BOOT_H */
View
8 software/bios/ddrinit.c
@@ -33,10 +33,10 @@ static void cdelay(int i)
static void setaddr(int a)
{
- CSR_DFII_AH_P0 = (a & 0x1fe0) >> 5;
- CSR_DFII_AL_P0 = a & 0x001f;
- CSR_DFII_AH_P1 = (a & 0x1fe0) >> 5;
- CSR_DFII_AL_P1 = a & 0x001f;
+ CSR_DFII_AH_P0 = (a & 0xff00) >> 8;
+ CSR_DFII_AL_P0 = a & 0x00ff;
+ CSR_DFII_AH_P1 = (a & 0xff00) >> 8;
+ CSR_DFII_AL_P1 = a & 0x00ff;
}
static void init_sequence(void)
View
80 software/bios/main.c
@@ -26,8 +26,11 @@
#include <extra/crc.h>
#include <hw/flash.h>
+#include <hw/minimac.h>
#include "ddrinit.h"
+#include "timer.h"
+#include "boot.h"
enum {
CSR_IE = 1, CSR_IM, CSR_IP, CSR_ICC, CSR_DCC, CSR_CC, CSR_CFG, CSR_EBA,
@@ -311,9 +314,10 @@ static void help(void)
puts("crc - compute CRC32 of a part of the address space");
puts("rcsr - read processor CSR");
puts("wcsr - write processor CSR");
+ puts("netboot - boot via TFTP");
+ puts("serialboot - boot via SFL");
+ puts("flashboot - boot from flash");
puts("version - display version");
- puts("reboot - system reset");
- puts("reconf - reload FPGA configuration");
}
static char *get_token(char **str)
@@ -343,6 +347,10 @@ static void do_command(char *c)
else if(strcmp(token, "mc") == 0) mc(get_token(&c), get_token(&c), get_token(&c));
else if(strcmp(token, "crc") == 0) crc(get_token(&c), get_token(&c));
+ else if(strcmp(token, "flashboot") == 0) flashboot();
+ else if(strcmp(token, "serialboot") == 0) serialboot();
+ else if(strcmp(token, "netboot") == 0) netboot();
+
else if(strcmp(token, "version") == 0) puts(VERSION);
else if(strcmp(token, "help") == 0) help();
@@ -390,6 +398,17 @@ static void crcbios(void)
}
}
+static void ethreset(void)
+{
+ CSR_MINIMAC_PHYRST = 0;
+ busy_wait(2);
+ /* that pesky ethernet PHY needs two resets at times... */
+ CSR_MINIMAC_PHYRST = 1;
+ busy_wait(2);
+ CSR_MINIMAC_PHYRST = 0;
+ busy_wait(2);
+}
+
static void print_mac(void)
{
unsigned char *macadr = (unsigned char *)FLASH_OFFSET_MAC_ADDRESS;
@@ -437,6 +456,54 @@ static void readstr(char *s, int size)
}
}
+static int test_user_abort(void)
+{
+ char c;
+
+ printf("Automatic boot in 2 seconds...\n");
+ printf("Q/ESC: abort boot\n");
+ printf("F7: boot from serial\n");
+ printf("F8: boot from network\n");
+ timer_enable(0);
+ timer_set_reload(0);
+ timer_set_counter(get_system_frequency()*2);
+ timer_enable(1);
+ while(timer_get()) {
+ if(readchar_nonblock()) {
+ c = readchar();
+ if((c == 'Q')||(c == '\e')) {
+ puts("Aborted");
+ return 0;
+ }
+ if(c == 0x06) {
+ serialboot();
+ return 0;
+ }
+ if(c == 0x07) {
+ netboot();
+ return 0;
+ }
+ }
+ }
+ return 1;
+}
+
+static void boot_sequence(void)
+{
+ if(test_user_abort()) {
+ if(rescue) {
+ netboot();
+ serialboot();
+ flashboot();
+ } else {
+ flashboot();
+ netboot();
+ serialboot();
+ }
+ printf("No boot medium found\n");
+ }
+}
+
int main(int i, char **c)
{
char buffer[64];
@@ -452,14 +519,13 @@ int main(int i, char **c)
if(rescue)
printf("Rescue mode\n");
board_init();
+ ethreset();
print_mac();
ddr_ok = ddrinit();
- if(ddr_ok) {
- printf("Booting...\n");
- } else {
+ if(ddr_ok)
+ boot_sequence();
+ else
printf("Memory initialization failed\n");
- }
-
while(1) {
putsnonl("\e[1mBIOS>\e[0m ");
View
400 software/bios/microudp.c
@@ -0,0 +1,400 @@
+/*
+ * Milkymist SoC (Software)
+ * Copyright (C) 2007, 2008, 2009, 2010, 2011 Sebastien Bourdeauducq
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdio.h>
+#include <system.h>
+#include <extra/crc.h>
+#include <hw/minimac.h>
+
+#include "microudp.h"
+
+#define ETHERTYPE_ARP 0x0806
+#define ETHERTYPE_IP 0x0800
+
+struct ethernet_header {
+ unsigned char preamble[8];
+ unsigned char destmac[6];
+ unsigned char srcmac[6];
+ unsigned short ethertype;
+} __attribute__((packed));
+
+static void fill_eth_header(struct ethernet_header *h, const unsigned char *destmac, const unsigned char *srcmac, unsigned short ethertype)
+{
+ int i;
+
+ for(i=0;i<7;i++)
+ h->preamble[i] = 0x55;
+ h->preamble[7] = 0xd5;
+ for(i=0;i<6;i++)
+ h->destmac[i] = destmac[i];
+ for(i=0;i<6;i++)
+ h->srcmac[i] = srcmac[i];
+ h->ethertype = ethertype;
+}
+
+#define ARP_HWTYPE_ETHERNET 0x0001
+#define ARP_PROTO_IP 0x0800
+
+#define ARP_OPCODE_REQUEST 0x0001
+#define ARP_OPCODE_REPLY 0x0002
+
+struct arp_frame {
+ unsigned short hwtype;
+ unsigned short proto;
+ unsigned char hwsize;
+ unsigned char protosize;
+ unsigned short opcode;
+ unsigned char sender_mac[6];
+ unsigned int sender_ip;
+ unsigned char target_mac[6];
+ unsigned int target_ip;
+ unsigned char padding[18];
+} __attribute__((packed));
+
+#define IP_IPV4 0x45
+#define IP_DONT_FRAGMENT 0x4000
+#define IP_TTL 64
+#define IP_PROTO_UDP 0x11
+
+struct ip_header {
+ unsigned char version;
+ unsigned char diff_services;
+ unsigned short total_length;
+ unsigned short identification;
+ unsigned short fragment_offset;
+ unsigned char ttl;
+ unsigned char proto;
+ unsigned short checksum;
+ unsigned int src_ip;
+ unsigned int dst_ip;
+} __attribute__((packed));
+
+struct udp_header {
+ unsigned short src_port;
+ unsigned short dst_port;
+ unsigned short length;
+ unsigned short checksum;
+} __attribute__((packed));
+
+struct udp_frame {
+ struct ip_header ip;
+ struct udp_header udp;
+ char payload[];
+} __attribute__((packed));
+
+struct ethernet_frame {
+ struct ethernet_header eth_header;
+ union {
+ struct arp_frame arp;
+ struct udp_frame udp;
+ } contents;
+} __attribute__((packed));
+
+typedef union {
+ struct ethernet_frame frame;
+ unsigned char raw[1532];
+} ethernet_buffer;
+
+
+static int rxlen;
+static ethernet_buffer *rxbuffer;
+static ethernet_buffer *rxbuffer0;
+static ethernet_buffer *rxbuffer1;
+static int txlen;
+static ethernet_buffer *txbuffer;
+
+static void send_packet(void)
+{
+ unsigned int crc;
+
+ crc = crc32(&txbuffer->raw[8], txlen-8);
+ txbuffer->raw[txlen ] = (crc & 0xff);
+ txbuffer->raw[txlen+1] = (crc & 0xff00) >> 8;
+ txbuffer->raw[txlen+2] = (crc & 0xff0000) >> 16;
+ txbuffer->raw[txlen+3] = (crc & 0xff000000) >> 24;
+ txlen += 4;
+ CSR_MINIMAC_TXCOUNTH = (txlen & 0xff00) >> 8;
+ CSR_MINIMAC_TXCOUNTL = txlen & 0x00ff;
+ CSR_MINIMAC_TXSTART = 1;
+ while(!(CSR_MINIMAC_EV_PENDING & MINIMAC_EV_TX));
+ CSR_MINIMAC_EV_PENDING = MINIMAC_EV_TX;
+}
+
+static unsigned char my_mac[6];
+static unsigned int my_ip;
+
+/* ARP cache - one entry only */
+static unsigned char cached_mac[6];
+static unsigned int cached_ip;
+
+static void process_arp(void)
+{
+ if(rxlen < 68) return;
+ if(rxbuffer->frame.contents.arp.hwtype != ARP_HWTYPE_ETHERNET) return;
+ if(rxbuffer->frame.contents.arp.proto != ARP_PROTO_IP) return;
+ if(rxbuffer->frame.contents.arp.hwsize != 6) return;
+ if(rxbuffer->frame.contents.arp.protosize != 4) return;
+ if(rxbuffer->frame.contents.arp.opcode == ARP_OPCODE_REPLY) {
+ if(rxbuffer->frame.contents.arp.sender_ip == cached_ip) {
+ int i;
+ for(i=0;i<6;i++)
+ cached_mac[i] = rxbuffer->frame.contents.arp.sender_mac[i];
+ }
+ return;
+ }
+ if(rxbuffer->frame.contents.arp.opcode == ARP_OPCODE_REQUEST) {
+ if(rxbuffer->frame.contents.arp.target_ip == my_ip) {
+ int i;
+
+ fill_eth_header(&txbuffer->frame.eth_header,
+ rxbuffer->frame.contents.arp.sender_mac,
+ my_mac,
+ ETHERTYPE_ARP);
+ txlen = 68;
+ txbuffer->frame.contents.arp.hwtype = ARP_HWTYPE_ETHERNET;
+ txbuffer->frame.contents.arp.proto = ARP_PROTO_IP;
+ txbuffer->frame.contents.arp.hwsize = 6;
+ txbuffer->frame.contents.arp.protosize = 4;
+ txbuffer->frame.contents.arp.opcode = ARP_OPCODE_REPLY;
+ txbuffer->frame.contents.arp.sender_ip = my_ip;
+ for(i=0;i<6;i++)
+ txbuffer->frame.contents.arp.sender_mac[i] = my_mac[i];
+ txbuffer->frame.contents.arp.target_ip = rxbuffer->frame.contents.arp.sender_ip;
+ for(i=0;i<6;i++)
+ txbuffer->frame.contents.arp.target_mac[i] = rxbuffer->frame.contents.arp.sender_mac[i];
+ send_packet();
+ }
+ return;
+ }
+}
+
+static const unsigned char broadcast[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
+
+int microudp_arp_resolve(unsigned int ip)
+{
+ int i;
+ int tries;
+ int timeout;
+
+ if(cached_ip == ip) {
+ for(i=0;i<6;i++)
+ if(cached_mac[i]) return 1;
+ }
+ cached_ip = ip;
+ for(i=0;i<6;i++)
+ cached_mac[i] = 0;
+
+ for(tries=0;tries<5;tries++) {
+ /* Send an ARP request */
+ fill_eth_header(&txbuffer->frame.eth_header,
+ broadcast,
+ my_mac,
+ ETHERTYPE_ARP);
+ txlen = 68;
+ txbuffer->frame.contents.arp.hwtype = ARP_HWTYPE_ETHERNET;
+ txbuffer->frame.contents.arp.proto = ARP_PROTO_IP;
+ txbuffer->frame.contents.arp.hwsize = 6;
+ txbuffer->frame.contents.arp.protosize = 4;
+ txbuffer->frame.contents.arp.opcode = ARP_OPCODE_REQUEST;
+ txbuffer->frame.contents.arp.sender_ip = my_ip;
+ for(i=0;i<6;i++)
+ txbuffer->frame.contents.arp.sender_mac[i] = my_mac[i];
+ txbuffer->frame.contents.arp.target_ip = ip;
+ for(i=0;i<6;i++)
+ txbuffer->frame.contents.arp.target_mac[i] = 0;
+ send_packet();
+
+ /* Do we get a reply ? */
+ for(timeout=0;timeout<2000000;timeout++) {
+ microudp_service();
+ for(i=0;i<6;i++)
+ if(cached_mac[i]) return 1;
+ }
+ }
+
+ return 0;
+}
+
+static unsigned short ip_checksum(unsigned int r, void *buffer, unsigned int length, int complete)
+{
+ unsigned char *ptr;
+ int i;
+
+ ptr = (unsigned char *)buffer;
+ length >>= 1;
+
+ for(i=0;i<length;i++)
+ r += ((unsigned int)(ptr[2*i]) << 8)|(unsigned int)(ptr[2*i+1]) ;
+
+ /* Add overflows */
+ while(r >> 16)
+ r = (r & 0xffff) + (r >> 16);
+
+ if(complete) {
+ r = ~r;
+ r &= 0xffff;
+ if(r == 0) r = 0xffff;
+ }
+ return r;
+}
+
+void *microudp_get_tx_buffer(void)
+{
+ return txbuffer->frame.contents.udp.payload;
+}
+
+struct pseudo_header {
+ unsigned int src_ip;
+ unsigned int dst_ip;
+ unsigned char zero;
+ unsigned char proto;
+ unsigned short length;
+} __attribute__((packed));
+
+int microudp_send(unsigned short src_port, unsigned short dst_port, unsigned int length)
+{
+ struct pseudo_header h;
+ unsigned int r;
+
+ if((cached_mac[0] == 0) && (cached_mac[1] == 0) && (cached_mac[2] == 0)
+ && (cached_mac[3] == 0) && (cached_mac[4] == 0) && (cached_mac[5] == 0))
+ return 0;
+
+ txlen = length + sizeof(struct ethernet_header) + sizeof(struct udp_frame) + 8;
+ if(txlen < 72) txlen = 72;
+
+ fill_eth_header(&txbuffer->frame.eth_header,
+ cached_mac,
+ my_mac,
+ ETHERTYPE_IP);
+
+ txbuffer->frame.contents.udp.ip.version = IP_IPV4;
+ txbuffer->frame.contents.udp.ip.diff_services = 0;
+ txbuffer->frame.contents.udp.ip.total_length = length + sizeof(struct udp_frame);
+ txbuffer->frame.contents.udp.ip.identification = 0;
+ txbuffer->frame.contents.udp.ip.fragment_offset = IP_DONT_FRAGMENT;
+ txbuffer->frame.contents.udp.ip.ttl = IP_TTL;
+ h.proto = txbuffer->frame.contents.udp.ip.proto = IP_PROTO_UDP;
+ txbuffer->frame.contents.udp.ip.checksum = 0;
+ h.src_ip = txbuffer->frame.contents.udp.ip.src_ip = my_ip;
+ h.dst_ip = txbuffer->frame.contents.udp.ip.dst_ip = cached_ip;
+ txbuffer->frame.contents.udp.ip.checksum = ip_checksum(0, &txbuffer->frame.contents.udp.ip,
+ sizeof(struct ip_header), 1);
+
+ txbuffer->frame.contents.udp.udp.src_port = src_port;
+ txbuffer->frame.contents.udp.udp.dst_port = dst_port;
+ h.length = txbuffer->frame.contents.udp.udp.length = length + sizeof(struct udp_header);
+ txbuffer->frame.contents.udp.udp.checksum = 0;
+
+ h.zero = 0;
+ r = ip_checksum(0, &h, sizeof(struct pseudo_header), 0);
+ if(length & 1) {
+ txbuffer->frame.contents.udp.payload[length] = 0;
+ length++;
+ }
+ r = ip_checksum(r, &txbuffer->frame.contents.udp.udp,
+ sizeof(struct udp_header)+length, 1);
+ txbuffer->frame.contents.udp.udp.checksum = r;
+
+ send_packet();
+
+ return 1;
+}
+
+static udp_callback rx_callback;
+
+static void process_ip(void)
+{
+ if(rxlen < (sizeof(struct ethernet_header)+sizeof(struct udp_frame))) return;
+ /* We don't verify UDP and IP checksums and rely on the Ethernet checksum solely */
+ if(rxbuffer->frame.contents.udp.ip.version != IP_IPV4) return;
+ // check disabled for QEMU compatibility
+ //if(rxbuffer->frame.contents.udp.ip.diff_services != 0) return;
+ if(rxbuffer->frame.contents.udp.ip.total_length < sizeof(struct udp_frame)) return;
+ // check disabled for QEMU compatibility
+ //if(rxbuffer->frame.contents.udp.ip.fragment_offset != IP_DONT_FRAGMENT) return;
+ if(rxbuffer->frame.contents.udp.ip.proto != IP_PROTO_UDP) return;
+ if(rxbuffer->frame.contents.udp.ip.dst_ip != my_ip) return;
+ if(rxbuffer->frame.contents.udp.udp.length < sizeof(struct udp_header)) return;
+
+ if(rx_callback)
+ rx_callback(rxbuffer->frame.contents.udp.ip.src_ip, rxbuffer->frame.contents.udp.udp.src_port, rxbuffer->frame.contents.udp.udp.dst_port, rxbuffer->frame.contents.udp.payload, rxbuffer->frame.contents.udp.udp.length-sizeof(struct udp_header));
+}
+
+void microudp_set_callback(udp_callback callback)
+{
+ rx_callback = callback;
+}
+
+static void process_frame(void)
+{
+ int i;
+ unsigned int received_crc;
+ unsigned int computed_crc;
+
+ flush_cpu_dcache();
+ for(i=0;i<7;i++)
+ if(rxbuffer->frame.eth_header.preamble[i] != 0x55) return;
+ if(rxbuffer->frame.eth_header.preamble[7] != 0xd5) return;
+ received_crc = ((unsigned int)rxbuffer->raw[rxlen-1] << 24)
+ |((unsigned int)rxbuffer->raw[rxlen-2] << 16)
+ |((unsigned int)rxbuffer->raw[rxlen-3] << 8)
+ |((unsigned int)rxbuffer->raw[rxlen-4]);
+ computed_crc = crc32(&rxbuffer->raw[8], rxlen-12);
+ if(received_crc != computed_crc) return;
+
+ rxlen -= 4; /* strip CRC here to be consistent with TX */
+ if(rxbuffer->frame.eth_header.ethertype == ETHERTYPE_ARP) process_arp();
+ else if(rxbuffer->frame.eth_header.ethertype == ETHERTYPE_IP) process_ip();
+}
+
+void microudp_start(unsigned char *macaddr, unsigned int ip)
+{
+ int i;
+
+ CSR_MINIMAC_EV_PENDING = MINIMAC_EV_RX0 | MINIMAC_EV_RX1 | MINIMAC_EV_TX;
+
+ rxbuffer0 = (ethernet_buffer *)MINIMAC_RX0_BASE;
+ rxbuffer1 = (ethernet_buffer *)MINIMAC_RX1_BASE;
+ txbuffer = (ethernet_buffer *)MINIMAC_TX_BASE;
+
+ for(i=0;i<6;i++)
+ my_mac[i] = macaddr[i];
+ my_ip = ip;
+
+ cached_ip = 0;
+ for(i=0;i<6;i++)
+ cached_mac[i] = 0;
+
+ rx_callback = (udp_callback)0;
+}
+
+void microudp_service(void)
+{
+ if(CSR_MINIMAC_EV_PENDING & MINIMAC_EV_RX0) {
+ rxlen = (CSR_MINIMAC_RXCOUNT0H << 8) | CSR_MINIMAC_RXCOUNT0L;
+ rxbuffer = rxbuffer0;
+ process_frame();
+ CSR_MINIMAC_EV_PENDING = MINIMAC_EV_RX0;
+ }
+ if(CSR_MINIMAC_EV_PENDING & MINIMAC_EV_RX1) {
+ rxlen = (CSR_MINIMAC_RXCOUNT1H << 8) | CSR_MINIMAC_RXCOUNT1L;
+ rxbuffer = rxbuffer1;
+ process_frame();
+ CSR_MINIMAC_EV_PENDING = MINIMAC_EV_RX1;
+ }
+}
View
34 software/bios/microudp.h
@@ -0,0 +1,34 @@
+/*
+ * Milkymist SoC (Software)
+ * Copyright (C) 2007, 2008, 2009, 2010, 2011 Sebastien Bourdeauducq
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __NET_MICROUDP_H
+#define __NET_MICROUDP_H
+
+#define IPTOINT(a, b, c, d) ((a << 24)|(b << 16)|(c << 8)|d)
+
+#define MICROUDP_BUFSIZE (5*1532)
+
+typedef void (*udp_callback)(unsigned int src_ip, unsigned short src_port, unsigned short dst_port, void *data, unsigned int length);
+
+void microudp_start(unsigned char *macaddr, unsigned int ip);
+int microudp_arp_resolve(unsigned int ip);
+void *microudp_get_tx_buffer(void);
+int microudp_send(unsigned short src_port, unsigned short dst_port, unsigned int length);
+void microudp_set_callback(udp_callback callback);
+void microudp_service(void);
+
+#endif /* __NET_MICROUDP_H */
View
136 software/bios/tftp.c
@@ -0,0 +1,136 @@
+/*
+ * Milkymist SoC (Software)
+ * Copyright (C) 2007, 2008, 2009, 2010, 2012 Sebastien Bourdeauducq
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <string.h>
+
+#include "microudp.h"
+#include "tftp.h"
+
+#define PORT_OUT 69
+#define PORT_IN 7642
+
+static int format_request(char *buf, const char *filename)
+{
+ *buf++ = 0x00; /* Opcode: Request */
+ *buf++ = 0x01;
+ strcpy(buf, filename);
+ buf += strlen(filename);
+ *buf++ = 0x00;
+ *buf++ = 'o';
+ *buf++ = 'c';
+ *buf++ = 't';
+ *buf++ = 'e';
+ *buf++ = 't';
+ *buf++ = 0x00;
+ return 9+strlen(filename);
+}
+
+static int format_ack(char *buf, unsigned short block)
+{
+ *buf++ = 0x00; /* Opcode: Ack */
+ *buf++ = 0x04;
+ *buf++ = (block & 0xff00) >> 8;
+ *buf++ = (block & 0x00ff);
+ return 4;
+}
+
+static char *packet_data;
+static int total_length;
+static int transfer_finished;
+static char *dst_buffer;
+
+static void rx_callback(unsigned int src_ip, unsigned short src_port, unsigned short dst_port, void *_data, unsigned int length)
+{
+ unsigned char *data = (unsigned char *)_data;
+ unsigned short opcode;
+ unsigned short block;
+ int i;
+ int offset;
+
+ if(length < 4) return;
+ if(dst_port != PORT_IN) return;
+ opcode = ((unsigned short)(data[0]) << 8)|((unsigned short)(data[1]));
+ block = ((unsigned short)(data[2]) << 8)|((unsigned short)(data[3]));
+ if(block < 1) return;
+ if(opcode == 3) { /* Data */
+ length -= 4;
+ offset = (block-1)*512;
+ for(i=0;i<length;i++)
+ dst_buffer[offset+i] = data[i+4];
+ total_length += length;
+ if(length < 512)
+ transfer_finished = 1;
+
+ length = format_ack(packet_data, block);
+ microudp_send(PORT_IN, src_port, length);
+ }
+ if(opcode == 5) { /* Error */
+ total_length = -1;
+ transfer_finished = 1;
+ }
+}
+
+int tftp_get(unsigned int ip, const char *filename, char *buffer)
+{
+ int len;
+ int tries;
+ int i;
+ int length_before;
+
+ if(!microudp_arp_resolve(ip))
+ return -1;
+
+ microudp_set_callback(rx_callback);
+
+ packet_data = microudp_get_tx_buffer();
+ dst_buffer = buffer;
+
+ total_length = 0;
+ transfer_finished = 0;
+ tries = 5;
+ while(1) {
+ len = format_request(packet_data, filename);
+ microudp_send(PORT_IN, PORT_OUT, len);
+ for(i=0;i<2000000;i++) {
+ microudp_service();
+ if((total_length > 0) || transfer_finished) break;
+ }
+ if((total_length > 0) || transfer_finished) break;
+ tries--;
+ if(tries == 0) {
+ microudp_set_callback(NULL);
+ return -1;
+ }
+ }
+
+ length_before = total_length;
+ while(!transfer_finished) {
+ if(length_before != total_length) {
+ i = 12000000;
+ length_before = total_length;
+ }
+ if(i-- == 0) {
+ microudp_set_callback(NULL);
+ return -1;
+ }
+ microudp_service();
+ }
+
+ microudp_set_callback(NULL);
+
+ return total_length;
+}
View
24 software/bios/tftp.h
@@ -0,0 +1,24 @@
+/*
+ * Milkymist SoC (Software)
+ * Copyright (C) 2007, 2008, 2009, 2010 Sebastien Bourdeauducq
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __NET_TFTP_H
+#define __NET_TFTP_H
+
+int tftp_get(unsigned int ip, const char *filename, char *buffer);
+
+#endif /* __NET_TFTP_H */
+
View
63 software/bios/timer.c
@@ -0,0 +1,63 @@
+/*
+ * Milkymist SoC (Software)
+ * Copyright (C) 2012 Sebastien Bourdeauducq
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <hw/timer.h>
+
+#include "timer.h"
+
+unsigned int get_system_frequency(void)
+{
+ return 83333333; /* TODO */
+}
+
+void timer_enable(int en)
+{
+ CSR_TIMER0_EN = en;
+}
+
+unsigned int timer_get(void)
+{
+ return (CSR_TIMER0_COUNT3 << 24)
+ |(CSR_TIMER0_COUNT2 << 16)
+ |(CSR_TIMER0_COUNT1 << 8)
+ |CSR_TIMER0_COUNT0;
+}
+
+void timer_set_counter(unsigned int value)
+{
+ CSR_TIMER0_COUNT3 = (value & 0xff000000) >> 24;
+ CSR_TIMER0_COUNT2 = (value & 0x00ff0000) >> 16;
+ CSR_TIMER0_COUNT1 = (value & 0x0000ff00) >> 8;
+ CSR_TIMER0_COUNT0 = value & 0x000000ff;
+}
+
+void timer_set_reload(unsigned int value)
+{
+ CSR_TIMER0_RELOAD3 = (value & 0xff000000) >> 24;
+ CSR_TIMER0_RELOAD2 = (value & 0x00ff0000) >> 16;
+ CSR_TIMER0_RELOAD1 = (value & 0x0000ff00) >> 8;
+ CSR_TIMER0_RELOAD0 = value & 0x000000ff;
+}
+
+void busy_wait(unsigned int ds)
+{
+ timer_enable(0);
+ timer_set_reload(0);
+ timer_set_counter(get_system_frequency()/10*ds);
+ timer_enable(1);
+ while(timer_get());
+}
View
28 software/bios/timer.h
@@ -0,0 +1,28 @@
+/*
+ * Milkymist SoC (Software)
+ * Copyright (C) 2012 Sebastien Bourdeauducq
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __TIMER_H
+#define __TIMER_H
+
+unsigned int get_system_frequency(void);
+void timer_enable(int en);
+unsigned int timer_get(void);
+void timer_set_counter(unsigned int value);
+void timer_set_reload(unsigned int value);
+void busy_wait(unsigned int ms);
+
+#endif /* __TIMER_H */
View
49 software/include/hw/minimac.h
@@ -0,0 +1,49 @@
+/*
+ * Milkymist SoC (Software)
+ * Copyright (C) 2007, 2008, 2009, 2010, 2012 Sebastien Bourdeauducq
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __HW_MINIMAC_H
+#define __HW_MINIMAC_H
+
+#include <hw/common.h>
+#include <csrbase.h>
+
+#define MINIMAC_CSR(x) MMPTR(MINIMAC_BASE+(x))
+
+#define CSR_MINIMAC_PHYRST MINIMAC_CSR(0x00)
+
+#define CSR_MINIMAC_RXCOUNT0H MINIMAC_CSR(0x04)
+#define CSR_MINIMAC_RXCOUNT0L MINIMAC_CSR(0x08)
+#define CSR_MINIMAC_RXCOUNT1H MINIMAC_CSR(0x0C)
+#define CSR_MINIMAC_RXCOUNT1L MINIMAC_CSR(0x10)
+
+#define CSR_MINIMAC_TXCOUNTH MINIMAC_CSR(0x14)
+#define CSR_MINIMAC_TXCOUNTL MINIMAC_CSR(0x18)
+#define CSR_MINIMAC_TXSTART MINIMAC_CSR(0x1C)
+
+#define CSR_MINIMAC_EV_STAT MINIMAC_CSR(0x20)
+#define CSR_MINIMAC_EV_PENDING MINIMAC_CSR(0x24)
+#define CSR_MINIMAC_EV_ENABLE MINIMAC_CSR(0x28)
+
+#define MINIMAC_EV_RX0 0x1
+#define MINIMAC_EV_RX1 0x2
+#define MINIMAC_EV_TX 0x4
+
+#define MINIMAC_RX0_BASE 0xb0000000
+#define MINIMAC_RX1_BASE 0xb0000800
+#define MINIMAC_TX_BASE 0xb0001000
+
+#endif /* __HW_MINIMAC_H */
View
44 software/include/hw/timer.h
@@ -0,0 +1,44 @@
+/*
+ * Milkymist SoC (Software)
+ * Copyright (C) 2007, 2008, 2009, 2010, 2012 Sebastien Bourdeauducq
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __HW_TIMER_H
+#define __HW_TIMER_H
+
+#include <hw/common.h>
+#include <csrbase.h>
+
+#define TIMER0_CSR(x) MMPTR(TIMER0_BASE+(x))
+
+#define CSR_TIMER0_EN TIMER0_CSR(0x00)
+
+#define CSR_TIMER0_COUNT3 TIMER0_CSR(0x04)
+#define CSR_TIMER0_COUNT2 TIMER0_CSR(0x08)
+#define CSR_TIMER0_COUNT1 TIMER0_CSR(0x0C)
+#define CSR_TIMER0_COUNT0 TIMER0_CSR(0x10)
+
+#define CSR_TIMER0_RELOAD3 TIMER0_CSR(0x14)
+#define CSR_TIMER0_RELOAD2 TIMER0_CSR(0x18)
+#define CSR_TIMER0_RELOAD1 TIMER0_CSR(0x1C)
+#define CSR_TIMER0_RELOAD0 TIMER0_CSR(0x20)
+
+#define CSR_TIMER0_EV_STAT TIMER0_CSR(0x24)
+#define CSR_TIMER0_EV_PENDING TIMER0_CSR(0x28)
+#define CSR_TIMER0_EV_ENABLE TIMER0_CSR(0x2C)
+
+#define TIMER0_EV 0x1
+
+#endif /* __HW_TIMER_H */
View
8 tools/mkmmimg.c
@@ -1,6 +1,6 @@
/*
* CRC32 computation tool and Milkymist image file writer
- * (c) 2009, 2010, Sebastien Bourdeauducq
+ * (c) 2009, 2010, 2012 Sebastien Bourdeauducq
* Released under GNU GPL v3
* This file is part of Milkymist.
*/
@@ -102,8 +102,8 @@ int main(int argc, char *argv[])
unsigned int crc;
if(((argc != 2) && (argc != 3) && (argc != 4))
- || ((argc > 2) && (strcmp(argv[2], "write") && (strcmp(argv[2], "writelzma"))))) {
- fprintf(stderr, "Usage: mkmmimg <filename> [write[lzma]] [dest]\n");
+ || ((argc > 2) && (strcmp(argv[2], "write")))) {
+ fprintf(stderr, "Usage: mkmmimg <filename> [write] [dest]\n");
return 1;
}
@@ -155,8 +155,6 @@ int main(int argc, char *argv[])
b[1] = (length & 0x00ff0000) >> 16;
b[2] = (length & 0x0000ff00) >> 8;
b[3] = (length & 0x000000ff) >> 0;
- if(strcmp(argv[2], "writelzma") == 0)
- b[0] |= 0x80;
write(fd_out, &b[0], 4);
b[0] = (crc & 0xff000000) >> 24;
b[1] = (crc & 0x00ff0000) >> 16;

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