[U-Boot-Users] FW: mpc8343 could not boot on u-boot-1.2.0

[Fowley, Douglas G (GE Infra, Energy)]

________________________________

	From: Dongying_Xu at us.alphanetworks.com
[mailto:Dongying_Xu at us.alphanetworks.com] 
	Sent: Monday, March 05, 2007 3:08 PM
	To: Fowley, Douglas G (GE Infra, Energy)
	Cc: u-boot-users at 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
 
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