From mboxrd@z Thu Jan 1 00:00:00 1970 Received: with ECARTIS (v1.0.0; list linux-mips); Wed, 28 Sep 2005 14:41:04 +0100 (BST) Received: from paris5.amen.fr ([62.193.203.10]:53765 "EHLO paris5.amen.fr") by ftp.linux-mips.org with ESMTP id S8133585AbVI1Nks (ORCPT ); Wed, 28 Sep 2005 14:40:48 +0100 Received: from firewall (46.237.98-84.rev.gaoland.net [84.98.237.46]) by paris5.amen.fr (8.10.2/8.10.2) with ESMTP id j8SDekv20844; Wed, 28 Sep 2005 15:40:46 +0200 Message-ID: <433A9CD9.6040906@avilinks.com> Date: Wed, 28 Sep 2005 15:38:33 +0200 From: Yoann Allain Organization: Avilinks User-Agent: Mozilla Thunderbird 1.0 (X11/20041206) X-Accept-Language: fr, en MIME-Version: 1.0 To: Florian DELIZY CC: linux-mips@linux-mips.org Subject: Re: =?ISO-8859-1?Q?R=E9f=2E_=3A_Compiling_a_2=2E6_kern?= =?ISO-8859-1?Q?el_for_Mips?= References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Return-Path: X-Envelope-To: <"|/home/ecartis/ecartis -s linux-mips"> (uid 0) X-Orcpt: rfc822;linux-mips@linux-mips.org Original-Recipient: rfc822;linux-mips@linux-mips.org X-archive-position: 9064 X-ecartis-version: Ecartis v1.0.0 Sender: linux-mips-bounce@linux-mips.org Errors-to: linux-mips-bounce@linux-mips.org X-original-sender: yallain@avilinks.com Precedence: bulk X-list: linux-mips Here is the function putPromChar in which I have the problem: 80101e70 : 80101e70: 3c028039 lui $v0,0x8039 80101e74: 244519f0 addiu $a1,$v0,6640 80101e78: 8ca30014 lw $v1,20($a1) 80101e7c: 00042600 sll $a0,$a0,24 80101e80: 27bdfff0 addiu $sp,$sp,-16 80101e84: 00043603 sra $a2,$a0,24 80101e88: 10600012 beqz $v1,80101ed4 80101e8c: 00001025 move $v0,$zero 80101e90: 8ca20004 lw $v0,4($a1) 80101e94: 3c038036 lui $v1,0x8036 80101e98: 8c64c9a0 lw $a0,-13920($v1) 80101e9c: 2442001c addiu $v0,$v0,28 80101ea0: 00822021 addu $a0,$a0,$v0 80101ea4: 00000000 nop 80101ea8: 8c820000 lw $v0,0($a0) 80101eac: 30420020 andi $v0,$v0,0x20 80101eb0: 1040fffd beqz $v0,80101ea8 80101eb4: 3c028039 lui $v0,0x8039 80101eb8: 8c4319f4 lw $v1,6644($v0) 80101ebc: 3c048036 lui $a0,0x8036 80101ec0: 8c82c9a0 lw $v0,-13920($a0) 80101ec4: 24630004 addiu $v1,$v1,4 80101ec8: 00431021 addu $v0,$v0,$v1 80101ecc: ac460000 sw $a2,0($v0) 80101ed0: 24020001 li $v0,1 80101ed4: 03e00008 jr $ra 80101ed8: 27bd0010 addiu $sp,$sp,16 80101edc: 00000000 nop with WinMon (bootloader) I get this (this is perhaps more readable...): [80101e70] 3c028039 lui r2,0x8039 putPromChar [80101e74] 244519f0 addiu r5,r2,0x19f0 [80101e78] 8ca30014 lw r3,0x0014(r5) [80101e7c] 00042600 sll r4,r4,24 [80101e80] 27bdfff0 addiu r29,r29,0xfff0 [80101e84] 00043603 sra r6,r4,24 [80101e88] 10600012 beq r3,r0,0x0012 [80101e90] 8ca20004 lw r2,0x0004(r5) --> in 2.6 it reads 0 at address r5 + 0x4 [80101e94] 3c038036 lui r3,0x8036 [80101e98] 8c64c9a0 lw r4,0xc9a0(r3) --> in 2.6 it reads 0 at adress r3 + 0xc9a0 [80101e9c] 2442001c addiu r2,r2,0x001c [80101ea0] 00822021 addu r4,r4,r2 ==> in 2.4 it returns bf010f1c in r4 [80101ea8] 8c820000 lw r2,0x0000(r4) * Exception 0x02 (user) : TLB (load or instruction fetch) * * in address: 80101ea8 ClockDiv2+0xe38: [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 I hope this will help and many thanks for your help! Yoann Florian DELIZY wrote: > > > > > > Hi, > > > 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 > > ClockDiv2+0xe38: > > [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: > > > kernel_entry > > 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. > > Regards > > Florian Delizy >