[U-Boot] DA850EVM with USE_NAND config does not pad the AIS file

[Heiko Schocher]

Hello Christian,

Am 06.05.2014 13:30, schrieb Christian Riesch:
> Tom,
> Thank you very much for your investigations :-)
>
> --On April 26, 2014 13:34 -0400 Tom Taylor <ttaylor.tampa at gmail.com> wrote:
>
>> I'm a U-Boot newbie so please feel free to correct how I'm reporting this
>> issue..
>>
>> I recently downloaded the 2014.04-rc3 snapshot to build U-Boot for my
>> custom DA850-based board. The only change was to add a new target
>> "dav850evm_nand" in boards.cfg with the added parameter "USE_NAND".
>>
>> The resulting AIS file was programmed into EVM-compatible NAND using
>> standard sfh_OMAP-L138 method.
>>
>> The board failed to boot, and stayed in a loop printing the SPL console
>> message repeatedly.
>>
>> After some debugging with CCS 5.5 and an XDS100v2, I found that incorrect
>> code was being loaded into the 0xc108000 RAM destination. The da850evm.h
>> file defines CONFIG_SYS_NAND_U_BOOT_OFFS as 0x28000, which corresponds to
>> an AIS offset of 0x8000 but the u-boot header did not appear there in the
>> AIS file. A search revealed that the Makefile catenated u-boot
>> immediately after the SPL without any padding.
>>
>> Further investigation revealed that the target Makefile needs
>> CONFIG_SPL_MAX_SIZE to be defined as 0x8000 in order for the padding to
>> be performed properly; however, this constant was apparently deleted
>> during a series of changes in April, 2013 to accommodate separate code
>> and BSS size limits for another target. In its place,
>> CONFIG_SPL_MAX_FOOTPRINT was defined as 32768. Unfortunately, the
>> da850evm Makefile does not refer to this constant.
>>
>> To solve the problem, I added the following 2 lines in my custom-modified
>> da850evm.h:
>> # define CONFIG_SPL_PAD_TO 0x8000
>> # define CONFIG_SPL_MAX_SIZE 0x8000
>>
>> although the first line may not be strictly required.
>
> Yes, CONFIG_SPL_PAD_TO is currently not used for the 'make u-boot.ais' target in the Makefile. Instead, the Makefile uses CONFIG_SPL_MAX_SIZE for padding the SPL, which is probably wrong.

Yes, CONFIG_SPL_PAD_TO is the correct define. On the other hand
the question is is CONFIG_SPL_PAD_TO not always equal to
CONFIG_SPL_MAX_SIZE ?

>> This solved the
>> problem and allowed the board to boot.
>>
>> Doesn't this mean that other similar targets may be broken?
>
> I think yes.
>
> I think the right fix would be to change the Makefile to use CONFIG_SPL_PAD_TO instead of CONFIG_SPL_MAX_SIZE for the u-boot.ais target.
>
> diff --git a/Makefile b/Makefile
> index ff38a43..869f442 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -890,7 +890,7 @@ MKIMAGEFLAGS_u-boot-spl.ais = -s -n $(if $(CONFIG_AIS_CONFIG_FILE), \
> spl/u-boot-spl.ais: spl/u-boot-spl.bin FORCE
> $(call if_changed,mkimage)
>
> -OBJCOPYFLAGS_u-boot.ais = -I binary -O binary --pad-to=$(CONFIG_SPL_MAX_SIZE)
> +OBJCOPYFLAGS_u-boot.ais = -I binary -O binary --pad-to=$(CONFIG_SPL_PAD_TO)
> u-boot.ais: spl/u-boot-spl.ais u-boot.img FORCE
> $(call if_changed,pad_cat)
>
>
> And then check all ARM926EJS/Davinci configurations that use SPL:
>
> (extending Tom Rini's grep command from his email)
>
> $ git grep -l ARM926EJS include/configs/ | xargs grep -l DAVINCI | xargs grep -l _SPL_
> include/configs/cam_enc_4xx.h
> include/configs/da830evm.h
> include/configs/da850evm.h
> include/configs/hawkboard.h
> include/configs/ipam390.h
>
> For the cam_enc_4xx CONFIG_SPL_PAD_TO is already defined, so it should work fine after fixing the Makefile. Heiko, any comments on this? Are you actually using the u-boot.ais target?

I have no board to test, but I think it is used.

> da830evm and hawkboard did not use CONFIG_SPL_MAX_SIZE, so no need to fix them.
>
> da850evm: We should add CONFIG_SPL_PAD_TO as already suggested by you.

>
> ipam390.h: I think the #define CONFIG_SPL_MAX_SIZE 0x20000 should be removed or replaced by #define CONFIG_SPL_PAD_TO 0x20000. But actually the board has been added after the commits that replace grep -lr CONFIG_SPL_MAX_SIZE by CONFIG_SPL_MAX_FOOTPRINT, so why
> didn't that issue come up when adding the board to mainline? Heiko, any comments? Are you using make u-boot.ais here or something else?

I am not sure, if we can just remove CONFIG_SPL_MAX_SIZE for this
board, as it maybe has only 0x20000 space for the SPL ?

maybe:

#if !defined(CONFIG_SPL_PAD_TO)
define CONFIG_SPL_PAD_TO CONFIG_SPL_MAX_SIZE
#endif

is better? Heh, thats the case, see:

./include/config_fallbacks.h

so, your Makefile patch should be Ok ...

bye,
Heiko
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