|To:||Yoann Allain <firstname.lastname@example.org>|
|Subject:||Réf. : Compiling a 2.6 kernel for Mips|
|From:||Florian DELIZY <email@example.com>|
|Date:||Wed, 28 Sep 2005 15:01:48 +0200|
> I am no more a newbie but I still need some help to build kernels :
> I am working on the Wintegra Evaluation Board (WEB777) and I used the
> 2.4 kernel Wintegra gave me with the patch for that board.
> I tried to adapt the patch for the 2.6 kernel but it doesn't work. I
> traced the kernel to find it crashed very early before displaying anything.
> In fact the host processor makes an address and tries to read it but
> this makes an exception :
> * Exception 0x02 (user) : TLB (load or instruction fetch) *
> * in address: 80101ea8
> [80101ea8] 8c820000 lw r2,0x0000(r4)
> r0(zero): 00000000 r1(AT) : 1000fc00 r2(v0) : 0000001c r3(v1) : 80360000
> r4(a0) : 0000001c r5(a1) : 803919f0 r6(a2) : 0000000d r7(a3) : 8038df8c
That would help a lot if you could objdump your kernel and give us 10 instructions before (at least)
and 10 instructions after it, you could try an :
mips-linux-objdump -DSz vmlinux | grep -U 20 '^\[80101ea8\]'
and send the output (that should ouput around 20 lines (which will hopefully contain some C code also,
assuùing that you compiled the code with debug informations. Moreover you can also tell us in which
symbol (function) is located the address 0x80101ea8.
> I think this is a problem of host processor misconfiguration, but don't
> find out exactly what it is... To make the address in R4, the processor
> reads some zeroes where in 2.4 kernel, it doesn't and the address read
> in 2.4 is something like 0xbf010f1c.
> I don't know if this can help but here are the few functions before crash:
> J start_kernel
> cpu_probe() (WEB777 patch)
> prom_init() (WEB777 patch)
> setup_prom_printf() (WEB777 patch)
> wds_prom_printf() (WEB777 patch)
> putPromChar() (WEB777 patch)
> --> CRASH
You should also start to figure out which variable/pointer anything is consulted to get this adress (0x0000001c)
which might then help to understand you're problem.
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