[U-Boot-Users] Flash write crash on MPC8548CDS

[ksi at koi8.net]

On Tue, 11 Mar 2008, Eran Liberty wrote:

Sorry guys for not being able to join you this time, extremely busy making
my programmers' team to meet a delivery deadline... I would've participated
but...

> Hi Andy,
>
> I am bringing us back online as I think your insights might enlighten
> others who might be googleing for answers. (I know i try my best when
> faced with problems)
>
> Andy Fleming wrote:
>> On Tue, Mar 11, 2008 at 3:13 AM, Eran Liberty <liberty at extricom.com>
> wrote:
>>
>>> FLASH: ERROR: too many flash sectors
>>>  ERROR: too many flash sectors
>>>  16 MB
>>
>> You should check that out.
> I know exactly why I see this one and I don't think its the problem.
>
>>
>>
>>
>>>  GPR00: 00029200 1FADBD40 1FADBF8C 0000F103 FF00113A 1FADBD32
> 000000A0
>>>  69A60E94
>>>  GPR08: 00000000 FF000000 00000003 1FFFC4D4 48028024 F7B7BFFF
> 1FFFB200
>>>  20040000
>>>  GPR16: 00000000 00000000 00000000 00000000 00000000 EFBFF5EF
> 1FADE338
>>>  1FADE240
>>>  GPR24: FF07FFFF 00000000 00000001 FF00113A F1030000 1FFEFD40
> 1FFFB8F4
>>>  1FFFC4D4
>>>  Call backtrace:
>>>  1FFEFD40 1FFCEB4C 1FFCF1F8 1FFDD9CC 1FFD8E40 1FFDFAA0 1FFE0148
>>>  1FFE02B0 1FFD16D4 1FFC9554 1FFC15FC
>>
>>
>> Notice that r27 is 0xf1030000
>>
>
> considering the command I did, cp.b 0xff800000 0xff000000 80000, I
> should have never accessed 0xf1030000.
>
>>
>>
>>>  => md e00050b0
>>>  e00050b0: 80000000 00000000 ffffffff 10110201    ................
>>>  e00050c0: f1030160 00000000 00000000 00000000    ...`............
>>
>>
>> 50b0: 80000000 -- This means you had a bus timeout
>>
>> 50bc: 10110201 -- This means the error occurred during a read
>> initiated by the processor.
>> 50c0: f1030160 -- Notice this address is based off r27.
>>
>> My theory (based on very little), is that you have f1030160 mapped for
>> some reason, and it's mapped unguarded.  And the LBC thinks it's in
>> its address space.  That's probably due to the LAWs.
>>
>> So...
>> 1) Check your LAWs.  Is f1030160 targeted at Local Bus?
>> 2) Check your TLBs.  Is f1030160 mapped?  If you have a bdi2000, it
>> can tell you if there are entries in the TLBs for that region.
>> 3) If f1030160 actually points at something that might not be ready
>> for transactions, you need to mark the region as "Guarded"
>>
>
> I have used mpc8548cds as a reference so my local bus is mapped from
> 0xf0000000 - 0xffffffff
> law.c will have this line:
> ====================== law.c snip ======================================
> 	/* LBC window - maps 256M 0xf0000000 -> 0xffffffff */
> 	SET_LAW_ENTRY(8, CFG_LBC_SDRAM_BASE, LAW_SIZE_256M,
> LAW_TRGT_IF_LBC),
> ========================================================================
>
> but tlb.c will have this for flash:
> ====================== tlb.c snip ======================================
> 	/*
> 	 * TLB 0:	16M	Non-cacheable, guarded
> 	 * 0xff000000	16M	FLASH
> 	 * Out of reset this entry is only 4K.
> 	 */
> 	SET_TLB_ENTRY(1, CFG_BOOT_BLOCK, CFG_BOOT_BLOCK,
> 		      MAS3_SX|MAS3_SW|MAS3_SR, MAS2_I|MAS2_G,
> 		      0, 0, BOOKE_PAGESZ_16M, 1),
>
> ========================================================================
>
> So we have local bus window mapping but not tlb mapping, which should be
> ok, because I should have accessed only addresses within the tlb mapped
> range.
>
> so I guess my follow up questions are:
> - Why does my u-boot thy to access this non flash address.?
> - Why is this a first time problem only?
> - Flash is written ok in the end. Why does it not hurt that actual
> write?
>
> Thanks for all the effort you are putting into my problem. It is
> immensely appreciated.
>
> Liberty
>
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