bcm47xx: add support for Linksys EA6500 v1

[kylehendrydev]

Specifications:

• BCM4706 600MHz MIPS 74Kc
• NOR flash: 1MB Macronix MX25L8006E
• NAND flash: 128MB Samsung K9F1G08U0D
• Ethernet: 5x GbE
• 2.4GHz wifi: BCM4331
• 5GHz wifi: BCM4360
• 2x USB 2.0 port
• 2x button
• 1x LED

Serial install instructions:

• Connect to 3.3V TTL serial console (Header DJ1 pinout Vcc Tx Rx NC Gnd)
• On the serial console, press CTRL-C on startup to access CFE prompt
• Configure workstation to IP address 192.168.1.100 and connect to a LAN port on router
• On CFE prompt, enter "flash -noheader : nflash1.trx"
• tftp send openwrt image to 192.168.1.1
• After flashing is complete, enter "go" in CFE

[kylehendrydev]

bcm4706-ea6500-v1-6.6.48.txt
Attached dmesg from device. There are a few errors that are probably non-issues:

[ 0.137313] can not parse nvram name (null)boardnum(null) with value ${serno} got -22

NVRAM parser expects boardnum to be a u16 and gets a string. I don't think anything actually uses this value and doesn't seems to affect functionality.

[ 0.148406] bcm47xx_soc: bus0: core 0x0534, irq: 2(S) 3 4 5 6 D* I
[ 0.149262] ------------[ cut here ]------------
[ 0.149269] WARNING: CPU: 0 PID: 1 at drivers/bcma/host_soc.c:140 bcma_host_soc_aread32+0x60/0x70
[ 0.149313] Accessed core has no wrapper/agent
[ 0.149319] Modules linked in:
[ 0.149336] CPU: 0 PID: 1 Comm: swapper Tainted: G W 6.6.48 #0
[ 0.149358] Stack : 00000000 00000007 8181fdd8 80063fc0 00000000 00000004 00000000 00000000
[ 0.149422] 8181fc7c 807c0000 80790000 8065b934 8182f4c8 00000001 8181fc20 deca539b
[ 0.149483] 00000000 00000000 8065b934 00000002 0000000a 00000002 00000001 6d6f4320
[ 0.149543] 00000000 807c7dc9 807c7e00 fffffffc 00000001 8065b934 8181fd20 803af5c0
[ 0.149604] 00000009 00000007 8181fdd8 806b2bd0 00000000 00000020 00000000 807c0000
[ 0.149664] ...
[ 0.149678] Call Trace:
[ 0.149684] [<80006fd0>] show_stack+0x28/0xf0
[ 0.149729] [<8058e310>] dump_stack_lvl+0x38/0x60
[ 0.149756] [<800243b8>] __warn+0xb0/0xe4
[ 0.149784] [<80024478>] warn_slowpath_fmt+0x8c/0xac
[ 0.149807] [<803af5c0>] bcma_host_soc_aread32+0x60/0x70
[ 0.149832]
[ 0.149838] ---[ end trace 0000000000000000 ]---

In the wiki (1, 2) other BCM4706 boards show this warning. Core 0x0534 is BCMA_CORE_ALTA (I2S core). It's probably possible to add a nop handler to suppress this error but I don't think it's breaking anything.