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From: Dongying_Xu@us.alphanetworks.com [mailto:Dongying_Xu@us.alphanetworks.com] Sent: Monday, March 05, 2007 3:08 PM To: Fowley, Douglas G (GE Infra, Energy) Cc: u-boot-users@lists.sourceforge.net Subject: Re: [U-Boot-Users] mpc8343 could not boot on u-boot-1.2.0
Hi Doug, Are you using linux kernel? When you comment out 'enable address translation', can you successfully boot with linux kernel? When I comment out those line, it did help to boot until u-boot console shows up, but it failed to continue boot up with linux kernel. To make linux kernel working, I have to keep following old 1.1.3 version code in, which will cause another problem. Did you have similar problem? Thank you and best regards dongy un_setup_stack_in_data_cache: blr mr r14, r4 mr r15, r5 lis r4, (CFG_INIT_RAM_ADDR & 0xFFFE0000)@h mtspr DBAT0U, r4 ori r4, r4, 0x0002 mtspr DBAT0L, r4 isync /* un lock all the D-cache */ mfspr r4, HID0 lis r5, (~(HID0_DLOCK))@h ori r5, r5, (~(HID0_DLOCK))@l and r4, r4, r5 sync mtspr HID0 , r4 /* Re - Allocate Initial RAM in data cache.*/ li r0, 0 lis r4, (CFG_INIT_RAM_ADDR)@h ori r4, r4, (CFG_INIT_RAM_ADDR)@l li r5, 128*8 /* 128*8*32=32Kb */ mtctr r5 1: dcbz r0, r4 addi r4, r4, 32 bdnz 1b isync mflr r16 bl dcache_disable mtlr r16 blr
Hi Dongy,
I do not use Linux; I run QNX Neutrino. But I did have a similar problem running QNX when I switched to U-Boot 1.1.4 and beyond. U-Boot began leaving the data cache enabled with that version. Note that the last part of 1.1.3 snippet that you still use (above) disables the data cache.
I fixed it for QNX by adding "CFG_COMMAND_CACHE" to "CONFIG_COMMANDS" in my board header file in include/configs, and adding "dcache off; " to the appropriate spot in the bootcmd environment variable. In my case,
#define CONFIG_BOOTCOMMAND "tftp ${loadaddr} ${ifsfile}; " \ "dcache off; " \ "go ${loadaddr}"
Since my disable address translation trick got your U-Boot up and running, I suggest trying my data cache hack for Linux and reporting back.
Regards,
Doug