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.

cpu_init_crit: /* * 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- --RS) */ 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?

Regards. Xuezhang.

-----Original Message----- From: wd@denx.de [mailto:wd@denx.de] Sent: Thursday, January 12, 2006 5:04 PM To: Xuezhang Dong Cc: u-boot-users@lists.sourceforge.net Subject: Re: [U-Boot-Users] board porting question

In message <54AD0F12E08D1541B826BE97C98F99F11C29CE@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.

Thanks.

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?

Best regards,

Wolfgang Denk

-- Software Engineering: Embedded and Realtime Systems, Embedded Linux Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de Microsoft Multimedia: You have nice graphics, sound and animations when the system crashes.