Updated info about espressifs version

README.md

@@ -96,7 +96,6 @@ xtensa-esp32-elf-gdb   build/app-template.elf -ex 'target remote:1234'
 (gdb) monitor quit
 ```
 
-
 ## Windows 10
 
 Enable the windows subsystem for linux on Windows 10, 
@@ -124,6 +123,25 @@ Latest version of esp-idf recomends
 As location of partition is different for cmake
     gcc ../../toflash-cmake.c -o qemu_flash
 
+## Update May 2020
+Espressifs implementation is a bit to slow but more accurate.
+They have also released a useable rom file.
+This shows a way of how to have this version in parallell.
+Unless yoou have a really fast computer I do not recomend this version as
+it is way too slow. And debugging does not work so well.
+To build a parallell qeum_espressif qemu binary with espressifs implementation.
+```
+cd
+git clone https://github.com/Ebiroll/qemu-xtensa-esp32 -b  esp-develop esp-develop
+mkdir qemu_espressif
+cd qemu_espressif
+ ../esp-develop/configure --target-list=xtensa-softmmu     --enable-debug --enable-sanitizers     --disable-strip     --disable-capstone --disable-vnc
+make
+cp ../esp-develop/pc-bios/esp32-r0-rom.bin .
+Make sure you have a usable esp32flash.bin file then start with
+xtensa-softmmu/qemu-system-xtensa -nographic -M esp32 -drive file=esp32flash.bin,if=mtd,format=raw -s
+```
+
 ## Update Nov 2019
 Espressif has released a qemu for esp32
     https://github.com/espressif/qemu

toflash_espressif.c

@@ -0,0 +1,117 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+//
+// qemu_toflash
+// 
+// python /home/olas/esp/esp-idf/components/esptool_py/esptool/esptool.py --chip esp32 --port /dev/ttyUSB0 --baud 115200 --before default_reset --after hard_reset write_flash -z --flash_mode dio --flash_freq 40m --flash_size detect 
+// 0x1000  /home/olas/esp/esp-idf/examples/system/ota/build/bootloader/bootloader.bin  
+// 0x10000 /home/olas/esp/esp-idf/examples/system/ota/build/ota.bin 
+// 0x8000 /home/olas/esp/esp-idf/examples/system/ota/build/partitions_two_ota.bin
+//
+
+void merge_flash(char *binfile,char *flashfile,int flash_pos,int patch_hash)
+{
+    FILE *fbin;
+    FILE *fflash;
+    unsigned char *tmp_data;
+    int j=0;
+
+    int file_size=0;
+    int flash_size=0;
+
+    fbin = fopen(binfile, "rb");
+    if (fbin == NULL) {
+        printf("   Can't open '%s' for reading.\n", binfile);
+		return;
+	}
+
+    if (fseek(fbin, 0 , SEEK_END) != 0) {
+        printf("   Can't seek end of '%s'.\n", binfile);
+       /* Handle Error */
+    }
+    file_size = ftell(fbin);
+
+    if (fseek(fbin, 0 , SEEK_SET) != 0) {
+      /* Handle Error */
+    }
+
+    fflash  = fopen(flashfile, "rb+");
+    if (fflash == NULL) {
+        printf("   Can't open '%s' for writing.\n", flashfile);
+        return;
+    }
+    if (fseek(fflash, 0 , SEEK_END) != 0) {
+          printf("   Can't seek end of '%s'.\n", flashfile);
+       /* Handle Error */
+    }
+    flash_size = ftell(fflash);
+    rewind(fflash);
+    fseek(fflash,flash_pos,SEEK_SET);
+
+
+    tmp_data=malloc((1+file_size)*sizeof(char));
+
+    if (file_size<=0) {
+      printf("Not able to get file size %s",binfile);
+    }
+
+    int len_read=fread(tmp_data,sizeof(char),file_size,fbin);
+
+    if (patch_hash==1) {
+      for (j=0;j<33;j++)
+      {
+          tmp_data[file_size-j]=0;
+      }
+    }
+
+
+    int len_write=fwrite(tmp_data,sizeof(char),file_size,fflash);
+
+    if (len_read!=len_write) {
+      printf("Not able to merge %s, %d bytes read,%d to write,%d file_size\n",binfile,len_read,len_write,file_size);
+      //while()
+
+
+    }
+
+    fclose(fbin);
+
+    if (fseek(fflash, 0x3E8000*4 , SEEK_SET) != 0) {
+    }
+
+    fclose(fflash);
+
+    free(tmp_data);
+}
+
+
+int main(int argc,char *argv[])
+{
+
+    if (argc>1) {
+      if (strcmp(argv[1],"-bl")==0)  {
+        printf("Overwrite bootloader only \n");
+        merge_flash("build/bootloader/bootloader.bin","esp32flash.bin",0x1000,0);
+        system("cp esp32flash.bin ~/qemu_espressif");
+        exit(0);
+
+      }
+    }
+    // Overwrites esp32flash.bin file
+
+    system("dd if=/dev/zero bs=1M count=4  | tr \"\\000\" \"\\377\" >  esp32flash.bin");
+
+    // Add bootloader
+    merge_flash("build/bootloader/bootloader.bin","esp32flash.bin",0x1000,0);
+    // Add partitions, 
+    merge_flash("build/partition_table/partition-table.bin","esp32flash.bin",0x8000,0);
+    // Add application
+    if (argc>1) {
+      merge_flash(argv[1],"esp32flash.bin",0x10000,0);
+    } else {
+      merge_flash("build/app-template.bin","esp32flash.bin",0x10000,0);
+    }
+    system("cp esp32flash.bin ~/qemu_esp32");
+}
+