Re: [microblaze-uclinux] Hang in machine_early_init

[Michal Simek <monstr@xxxxxxxxx>]

Hi Kenneth,

these part of code is OK.

1. It will be helpful if you wrote what kernel is it (MMU/noMMU)
2. cat System.map | grep __log_buf
2a. for noMMU ... output is 0x30004344
2b. for MMU  ... output is 0xC0004344
3. use U-BOOT for debugging. You can remove it in your final product.
3a. for both kernel use this command in U-BOOT md 30004344
4. for noMMU kernel is possibility to use heartbeat function.
Look at arch/microblaze/kernel/heartbeat.c - this helps you to see if your linux
kernel lives. I hope you set address to LED diodes not to push button or switches.

Regards,
Michal Simek


> This value of BSS looks correct in the system.map file.  I am attaching
> that and the sytem.mss file as well.  The only thing of interest here is
> the petalinx below.  There is no address, just the size.
> 
> 
> BEGIN OS
>  PARAMETER OS_NAME = petalinux
>  PARAMETER OS_VER = 1.00.b
>  PARAMETER PROC_INSTANCE = microblaze_0
>  PARAMETER STDIN = RS232_Uart
>  PARAMETER STDOUT = RS232_Uart
>  PARAMETER main_memory = mch_opb_ddr_0
>  PARAMETER main_memory_bank = 0
>  PARAMETER main_memory_size = 0x08000000
> END
> 
> -----Original Message-----
> From: owner-microblaze-uclinux@xxxxxxxxxxxxxx
> [mailto:owner-microblaze-uclinux@xxxxxxxxxxxxxx] On Behalf Of John
> Williams
> Sent: Monday, April 28, 2008 6:49 PM
> To: microblaze-uclinux@xxxxxxxxxxxxxx
> Subject: Re: [microblaze-uclinux] Hang in machine_early_init
> 
> Hi Ken,
> 
> Kenneth Schultz wrote:
>> I am having a problem with hanging after copying code in
>> machine_early_int.  The code flow is given at the bottom.  Notice that
> I
>> added out some print statements which give the following lines
>>
>> 	FS-BOOT: Booting image...
>> 	Found romfs @ 0x3018a000 (0x000f6000)
>> 	#### klimit 3019d000 ####
>> 	Moving 0x000f6000 bytes from 0x3018a000 to 0x3019cf20
>> 	New klimit: 0x30293000
>> 	MemSet1 __bss_start 0x3018a000
>> 	MemSet1 __bss_stop 0x3019cf20
>> 	MemSet1 __bss_stop-__bss_start 0x12f20
>>
>>
>>
>> However, I have some concerns about this range of memory.  Since I am
>> not using a boot loader, I just copied image.bin from 0x3000_0000 to
>> 0x3028_0026 and then branched to 0x3000_0000.  So the below code seems
>> to be deleting parts of the downloaded code.  This, I expect is my
>> problem and I need to re-locate portions of this code.  I was under
> the
>> impression, that I should just be able to call this image and it will
>> relocate itself.  I may be wrong here...  
> 
> image.bin is intended to be loaded and executed at the start address (no
> 
> relocation required).  In that sense you seem to be doing the right 
> thing, but this stuff should Just Work.
> 
>   Note that the contents of BSS are not contained in image.bin (would 
> just be 10's of Kb of zeros).  So, the relocation is just moving the 
> ROMFS image from bss_start where it ends up after the download (it's 
> appended directly to linux.bin binary), to _bss_stop where the MTD 
> mapping driver expects to find it.
> 
> Some things to check.
> 
> Does the reported BSS size (0x12f20) match what you see from analysing 
> linux-2.6.x/System.map?
> 
> Are you doing anything funky with memory or the kernel link script?
> 
> Have you run and verified a simple memory test standalone app?
> 
> Any override settings in system.mss for MAIN_MEMORY_START or _OFFSET?
> 
> 
> /John
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