Hello Komal,
Get an updated u-boot, a pull from the main head will result in something better in this regard.
I removed all the semi-confusing CONFIG_PARTIAL_SRAM references in the current images. I replaced it with much friendlier run time checks (is_running_in_sram, is_running_from_flash, is_running_in_sdram). This allows much easier debugging, and more understandable code.
As to your exact failure, I expect your problem is procedural at this stage. This bit of code when from the bin file, is expected to be running in flash, your disasm shows you already running in SDRAM, this is fine, but you would have had to load the elf file to get there...and this would imply your sdr and gel files have everything setup ok, and I bet this is not the case.
Regards, Richard W.
-----Original Message----- From: u-boot-users-admin@lists.sourceforge.net [mailto:u-boot-users- admin@lists.sourceforge.net] On Behalf Of Komal Shah Sent: Tuesday, February 01, 2005 11:18 PM To: u-boot-users@lists.sourceforge.net Subject: [U-Boot-Users] omap2420h4 u-boot debugging CCS JTAG
Richard,
I am trying to debug the omap2420h4 board u-boot through Code Composer Studio and xds560 JTAG.
I have compiled u-boot with CONFIG_PARTIAL_SRAM option.
CCS unable to debug after the STR instruction as "sp" becomes zero:
file: board/omap2420h4/platform.S:
#ifdef CONFIG_PARTIAL_SRAM ldr sp, SRAM_STACK str ip, [sp] /* stash old link register */ mov ip, lr /* save link reg across call */ ...
SRAM_STACK: .word LOW_LEVEL_SRAM_STACK
Where LOW_LEVEL_SRAM_STACK equals to 0x4020FFFC .
As per the observation of registers and assembly code in CCS: ---------------snip------------------- 80E80570 01832100 ORREQ R2, R3, R0, LSL #2 80E80574 E1A03000 MOV R3, R0, R0 80E80578 E59FD028 LDR R13, 0x80E805A8 80E8057C E58DC000 STR R12, [R13] 80E80580 E1A0C00E MOV R12, R0, R14 ---------------snip-------------------
Where value of R13 becomes zero. And due to that it is failing at "STR R12, [R13]".
This seems to me the problem in accessing SRAM. Any hints on debugging the u-boot on the above case would be usefull for me on porting this code to the board based on similar core (omap2420).
===== ---Komal Shah
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