[U-Boot-Users] board porting question
xdong at broadcom.com
Fri Jan 13 03:39:48 CET 2006
I figure out this problem, it is due to the code in start.S set up
Align, so the data read from 16-bit-bus throught ldrb will revert in
big-endian case, and OMAP is little-endian, so they are OK.
* flush v4 I/D caches
mov r0, #0
mcr p15, 0, r0, c7, c7, 0 /* flush v3/v4 cache */
mcr p15, 0, r0, c8, c7, 0 /* flush v4 TLB */
* disable MMU stuff and caches
mrc p15, 0, r0, c1, c0, 0
bic r0, r0, #0x00002300 /* clear bits 13, 9:8 (--V-
bic r0, r0, #0x00000087 /* clear bits 7, 2:0 (B--- -CAM)
orr r0, r0, #0x00000002 /* set bit 2 (A) Align */
orr r0, r0, #0x00001000 /* set bit 12 (I) I-Cache */
mcr p15, 0, r0, c1, c0, 0
* Go setup Memory and board specific bits prior to relocation.
mov ip, lr /* perserve link reg across call */
bl platformsetup /* go setup pll,mux,memory */
mov lr, ip /* restore link */
mov pc, lr /* back to my caller */
I was debugging the ns16550 (serial driver), and find out that my serial
port is not logically as same as theirs. I was assume that UART is very
standard, is it true? Any suggestion of other serial drive I can try?
From: wd at denx.de [mailto:wd at denx.de]
Sent: Thursday, January 12, 2006 5:04 PM
To: Xuezhang Dong
Cc: u-boot-users at lists.sourceforge.net
Subject: Re: [U-Boot-Users] board porting question
<54AD0F12E08D1541B826BE97C98F99F11C29CE at NT-SJCA-0751.brcm.ad.broadcom.co
m> you wrote:
> Thanks for the reply and my appology for the HTML format, I thought
> mail server will convert it. Never mind, it wonot happened again.
> I was using the latest toolchain from snapgear:
> ARM/XSCALE - arm-linux-tools-20051123.tar.gz
> And I supplied the compiler with -mbigarm parameter.
> Any idea how I can verify/debug this problem?
Attach your BDI2000 and fire up GDB?
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
You have nice graphics, sound and animations when the system crashes.
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