[U-Boot] [PATCH 13/13] mips: jz47xx: Add Creator CI20 platform

[Andreas Färber]

Am 12.02.2017 um 15:03 schrieb Marek Vasut:
> On 02/12/2017 02:24 PM, Andreas Färber wrote:
>> Am 12.02.2017 um 13:53 schrieb Marek Vasut:
>>> On 02/12/2017 01:24 PM, Andreas Färber wrote:
>>>> Am 12.02.2017 um 12:55 schrieb Marek Vasut:
>>>>> On 02/12/2017 12:52 PM, Andreas Färber wrote:
>>>>>> CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_USE_SECTOR=y leads to this error:
>>>>>>
>>>>>>   LD      spl/u-boot-spl
>>>>>> mipsel-suse-linux-ld.bfd: u-boot-spl section `.data' will not fit in
>>>>>> region `.sram'
>>>>>> mipsel-suse-linux-ld.bfd: region `.sram' overflowed by 288 bytes
>>>>>> ../scripts/Makefile.spl:304: recipe for target 'spl/u-boot-spl' failed
>>>>>> make[2]: *** [spl/u-boot-spl] Error 1
>>>>>> /home/andreas/OBS/u-boot/Makefile:1342: recipe for target
>>>>>> 'spl/u-boot-spl' failed
>>>>>> make[1]: *** [spl/u-boot-spl] Error 2
>>>>>> make[1]: Leaving directory '/home/andreas/OBS/u-boot/ci20'
>>>>>> Makefile:150: recipe for target 'sub-make' failed
>>>>>> make: *** [sub-make] Error 2
>>>>>>
>>>>>> I've reviewed all SPL Kconfig options and found three seemingly unneeded
>>>>>> options defaulting to y, but I did not find a way to get this number
>>>>>> down even a single byte with my GCC 6.3.1, and the recommended 4.8.1 was
>>>>>> even worse (~748).
>>>> I'm looking into a gcc7 package next, but that'll take a bit.
>>>
>>> I don't think that's gonna help with U-Boot's bloat. [...]
>>
>> Yeah, slightly down with GCC 7.0.1, but not much:
> 
> Right, it's the new bloat ...
> 
>>   LD      spl/u-boot-spl
>> mipsel-suse-linux-ld.bfd: u-boot-spl section `.data' will not fit in
>> region `.sram'
>> mipsel-suse-linux-ld.bfd: region `.sram' overflowed by 264 bytes
>> ../scripts/Makefile.spl:304: recipe for target 'spl/u-boot-spl' failed
>> make[2]: *** [spl/u-boot-spl] Error 1
>> /home/andreas/OBS/u-boot/Makefile:1342: recipe for target
>> 'spl/u-boot-spl' failed
>> make[1]: *** [spl/u-boot-spl] Error 2
>> make[1]: Leaving directory '/home/andreas/OBS/u-boot/ci20'
>> Makefile:150: recipe for target 'sub-make' failed
>> make: *** [sub-make] Error 2

Update: I've rebased the patchset to latest master
(8cb3ce64f936f5dedbcfc1935c5caf31bb682474 / "Merge
git://git.denx.de/u-boot-dm") - BMIPS caused trivial conflicts, and DM
API changes needed to be accounted for.

https://github.com/afaerber/u-boot/commits/ci20

By further disabling CONFIG_SPL_RAW_IMAGE_SUPPORT in the ci20 defconfig
I am now at 344 bytes overflow (gcc 7.1.1):

  LD      spl/u-boot-spl
mipsel-suse-linux-ld.bfd: u-boot-spl section `.data' will not fit in
region `.sram'
mipsel-suse-linux-ld.bfd: region `.sram' overflowed by 344 bytes
../scripts/Makefile.spl:333: recipe for target 'spl/u-boot-spl' failed
make[2]: *** [spl/u-boot-spl] Error 1
/home/andreas/OBS/u-boot/Makefile:1382: recipe for target
'spl/u-boot-spl' failed
make[1]: *** [spl/u-boot-spl] Error 2

By disabling SPL GPIO support and hardcoding a board revision instead of
detecting it via GPIOs, I can get it down to 80 bytes.

By aggressively adding #ifndef CONFIG_SPL_BUILD in ci20.c I'm down to 64
bytes, but not sure if some of that is actually needed for SPL...

Tom, do you see a chance of merging any of the drivers without the whole
board building, so that we can reduce the rebasing work and get a common
base for optimizing?

Regards,
Andreas

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