[U-Boot] no DTB with nand SPL on sama5d3

Daniel Evans photonthunder at gmail.com
Mon Jan 21 20:51:40 UTC 2019 

Currently the boot.bin is only 50670 bytes (208 bytes nand_header + 44820 bytes u-boot-spl-nodtb.bin + 5642 u-boot-spl.dtb).  I tried playing with  CONFIG_SPL_MAX_SIZE and CONFIG_SPL_PAD_TO and got no changing in the output binaries, and I couldn’t get any padding no matter the setting.  So even though MAX size is an issue I don’t think it is what is keeping the SPL from finding the dtb.

Insight on where that is set in code so that I can experiment?

Dan

> On Jan 21, 2019, at 1:06 AM, <Eugen.Hristev at microchip.com> <Eugen.Hristev at microchip.com> wrote:
> 
> 
> 
> On 20.01.2019 17:23, Ben Whitten wrote:
>> Hi,
>> 
>> On 17/01/2019 21:34, Daniel Evans wrote:
>>> Follow up question:
>>> 
>>> I notice that u-boot-spl-pad.bin is empty even though 
>>> CONFIG_SPL_PAD_TO = CONFIG_SPL_MAX_SIZE = 0x18000.  Is that why it 
>>> isn’t find the dtb because it isn’t padded properly?
>> 
>> As an aside although it buried as a footnote in the datasheet.
>> When the ROM code in the SAMA5D3 checks to see if SPL is valid code 
>> based on the size in the 6th vector or by checking the size of boot.bin 
>> from FAT, it must fit within SRAM0 (64KB, 0x10000) [1]
>> 
>> So whilst you have 128KB of SRAM, you can only load and execute SPL 
>> within 64KB (0x10000), perhaps CONFIG_SPL_MAX_SIZE should updated.
>> 
>> [1] Atmel SAMA5D3 datasheet, 11.4.3.1 under Figure 11-7, & 11.4.3.2.
>> 
>> Thanks,
>> Ben
> 
> It is true. 64 KB is reserved for Rom code itself (stack + code) and the 
> rest of 64KB is free for copying the application binary and executing it.
> If the MAX_SPL is wrong then we need to correct it. We also need to 
> check if it's oversized in which case it's normal that the DTB won't be 
> copied. Rom Code will copy at most 64 KB.
> 
> Daniel can you confirm this ?
> 
> Thanks
> 
>> 
>>> 
>>> Dan
>>> 
>>>> On Jan 17, 2019, at 2:09 AM, Eugen.Hristev at microchip.com wrote:
>>>> 
>>>> 
>>>> 
>>>> On 17.01.2019 11:05, Simon Goldschmidt wrote:
>>>>> On Thu, Jan 17, 2019 at 10:02 AM <Eugen.Hristev at microchip.com> wrote:
>>>>>> 
>>>>>> 
>>>>>> 
>>>>>> On 16.01.2019 21:05, Daniel Evans wrote:
>>>>>>> Hello,
>>>>>>> 
>>>>>>> Yes, I am trying to load the U-boot SPL
>>>>>>> 
>>>>>>> What I posted previously was a custom board.  I switched over to 
>>>>>>> the sama5d3_xplained and all I get with 
>>>>>>> sama5d3_xplained_nandflash_defconfig is ROMBOOT.
>>>>>> 
>>>>>> This is definitely weird. Are you using vanilla u-boot and no 
>>>>>> changes on
>>>>>> top with the sama5d3_xplained? Looks like not even your console 
>>>>>> works in
>>>>>> spl, or, you have a bad binary .
>>>>> 
>>>>> With debug uart enabled it shows the DTB is missing. So when using the
>>>>> mainline defconfig (where debug uart is disabled) it fails to find a 
>>>>> console as
>>>>> the DTB is missing. That's unfortunate, but expected behaviour with 
>>>>> DM_SERIAL,
>>>>> I guess.
>>>>> 
>>>>> I don't know the hardware, but the real problem seems to me that the 
>>>>> binary
>>>>> being flashed is somehow missing the DTB?
>>>> 
>>>> Yes that can happen, I suggested that some parts of the SPL are missing
>>>> - either the binary flashed is smaller than the real size (and the DTB,
>>>> being at the end is not copied...),
>>>> 
>>>> or the value inside the 6th vector is wrong, and the first stage
>>>> bootloader is not copying enough data from NAND to RAM when executing
>>>> the SPL binary. The first stage BL only copies the number of bytes given
>>>> by 6th vector value
>>>> 
>>>>> 
>>>>> Regards,
>>>>> Simon
>>>>> 
>>>>>> 
>>>>>>> 
>>>>>>> AT91bootstrap works fine.
>>>>>>> 
>>>>>>> I know there was the issue with the nand_header showing up for the 
>>>>>>> SD card but that shouldn’t effect the nand.  Some other patch I am 
>>>>>>> missing to get a non-modified boot.bin nand working?
>>>>>> 
>>>>>> How are you writing your nandflash ? are you using our sam-ba tool to
>>>>>> write it ? do you use writeboot applet ?
>>>>>> 
>>>>>>> 
>>>>>>> The size of the 6th reset vector looks correct, with the 
>>>>>>> assumption that it does not include the 208 bytes of nand_header?
>>>>>> 
>>>>>> Yes it should not include it. And if you write using sam-ba the nand
>>>>>> header will be written by sam-ba, so your binary should not include it
>>>>>> already.
>>>>>> 
>>>>>> I also suggest you open up a support ticket on 
>>>>>> support.microchip.com as
>>>>>> our FAE have a lot of experience to assist with such situations.
>>>>>> 
>>>>>> Hope this helps,
>>>>>> Eugen
>>>>>> 
>>>>>>> 
>>>>>>> Dan
>>>>>>> 
>>>>>>> 
>>>>>>> 
>>>>>>>> On Jan 16, 2019, at 6:02 AM, Eugen.Hristev at microchip.com wrote:
>>>>>>>> 
>>>>>>>> 
>>>>>>>> 
>>>>>>>> 
>>>>>>>> On 16.01.2019 03:13, Daniel Evans wrote:
>>>>>>>>> After flashing my boot.bin to nand I get the following output:
>>>>>>>>> 
>>>>>>>>> RomBOOT
>>>>>>>>> <debug_uart> Missing DTB
>>>>>>>>> ### ERROR ### Please RESET the board ###
>>>>>>>>> 
>>>>>>>>> I found the error message in fdtdec.c, but not sure what I am 
>>>>>>>>> missing.  I have checked that my DTB is included in the boot.bin 
>>>>>>>>> output.  Any insight on what I am missing?
>>>>>>>> 
>>>>>>>> Hello Daniel,
>>>>>>>> 
>>>>>>>> Which defconfig are you using when building u-boot ?
>>>>>>>> 
>>>>>>>> You are trying to load the U-boot SPL right ?
>>>>>>>> 
>>>>>>>> It doesn't look like you even get to the point when you get to 
>>>>>>>> load the
>>>>>>>> u-boot proper, so maybe there are missing parts from your SPL, or 
>>>>>>>> the
>>>>>>>> size inside the 6th reset vector is not correctly calculated
>>>>>>>> 
>>>>>>>> Did you try with our at91bootstrap proprietary second level 
>>>>>>>> bootloader
>>>>>>>> and get the same issue when booting the proper u-boot with it ?
>>>>>>>> 
>>>>>>>> Hope this helps,
>>>>>>>> 
>>>>>>>> Eugen
>>>>>>>> 
>>>>>>>>> 
>>>>>>>>> Dan
>>>>>>>>> _______________________________________________
>>>>>>>>> U-Boot mailing list
>>>>>>>>> U-Boot at lists.denx.de
>>>>>>>>> https://lists.denx.de/listinfo/u-boot
>>>>>>>>> 
>>>>>>> 
>>>>>>> 
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