I was able to get most of this working on the C139 but can't get an app to start when
I power the phone on after flash programming.
I connect the phone via usb and do
minicom --device /dev/ttyUSB0
with either short power press or a long one in minicom I get:
�A@ftmtoolerror
and the screen turns white on the phone.
I copied the loader.lds from compal_e88 and added to compal_e86 as well as the Makefile in
firmware. Modified things to reflect the larger amount of flash (4mb instead of 2mb) even
though this probably doesn't matter a whole lot.
I then program the C139 like this:
host/osmocon/osmoload memdump 0x000000 0x2000 compal_loader.bin
host/osmocon/osmoload funlock 0x000000 0x10000
host/osmocon/osmoload ferase 0x000000 0x10000
host/osmocon/osmoload fprogram 0 0x000000 compal_loader.bin
host/osmocon/osmoload fprogram 0 0x002000
target/firmware/board/compal_e86/hello_world.e86loader.bin
I tried other apps like loader and rssi to the same effect.
target/firmware/Makefile additions:
ENV_e86loader_LDS=board/compal_e86/loader.lds
ENV_e86loader_OBJS=board/compal/start.rom.o board/compal/header.o
board/compal/exceptions_redirect.o
ENV_e86flash_LDS=board/compal_e86/flash.lds
ENV_e86flash_OBJS=board/compal/start.rom.o board/compal/header.o
board/compal/exceptions_redirected.o board/compal/handlers.o
target/firmware/board/compal_e86/loader.lds
/* 4 MBytes of external flash memory */
FLASH (rx) : ORIGIN = 0x00000000, LENGTH = 0x400000
/* 256 kBytes of internal zero-waitstate sram */
IRAM (rw) : ORIGIN = 0x00800000, LENGTH = 0x040000
/* 256 kBytes of external slow sram */
ERAM (rw) : ORIGIN = 0x01000000, LENGTH = 0x040000
I was able to grab the first three flash pages (I cleared three pages to make room for
trying rssi fw) from another c140, reprogram them, and the phone starts fine with stock
firmware again.
I assume that a long power press causes a jump to 0x2000. Am I right?
If that's not the case then I would suppose I would need to write a firmware which
loads at 0x000000, injects the magic value at 0x83ce0 and then continues with code as
normal.
Thanks,
Craig
________________________________
From: Sylvain Munaut <246tnt(a)gmail.com>
To: Andreas <anmu(a)etc-network.de>
Cc: baseband-devel <baseband-devel(a)lists.osmocom.org>
Sent: Monday, September 30, 2013 1:03 PM
Subject: Re: bad crc when trying to flash application
bad crc 9bf1 (not e0bc) at offset 0x00000000
status 5242976, aborting
Make sure to use the very latest git. A patch was very recently pushed
wrt to this.
Cheers,
Sylvain