[U-Boot] [PATCH 3/6] ARM: socfpga: Add the configuration for FPGA SoCFPGA A10 SoCDK

[Marek Vasut]

On 1/15/19 9:16 AM, Chee, Tien Fong wrote:
> On Thu, 2019-01-03 at 21:15 +0100, Marek Vasut wrote:
>> On 1/3/19 6:36 AM, Chee, Tien Fong wrote:
>>>
>>> On Tue, 2019-01-01 at 21:29 +0100, Marek Vasut wrote:
>>>>
>>>> On 1/1/19 4:32 AM, Chee, Tien Fong wrote:
>>>>>
>>>>>
>>>>> On Sun, 2018-12-30 at 16:47 +0100, Marek Vasut wrote:
>>>>>>
>>>>>>
>>>>>> On 12/30/18 9:13 AM, tien.fong.chee at intel.com wrote:
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> From: Tien Fong Chee <tien.fong.chee at intel.com>
>>>>>>>
>>>>>>> Update the default configuration file to enable the
>>>>>>> necessary
>>>>>>> functionality
>>>>>>> to get the SoCFPGA loadfs driver support. This would enable
>>>>>>> the
>>>>>>> implementation of programming bitstream into FPGA from MMC.
>>>>>>>
>>>>>>> Signed-off-by: Tien Fong Chee <tien.fong.chee at intel.com>
>>>>>>> ---
>>>>>>>  configs/socfpga_arria10_defconfig |    8 ++++++++
>>>>>>>  1 files changed, 8 insertions(+), 0 deletions(-)
>>>>>>>
>>>>>>> diff --git a/configs/socfpga_arria10_defconfig
>>>>>>> b/configs/socfpga_arria10_defconfig
>>>>>>> index 6ebda81..8158dbb 100644
>>>>>>> --- a/configs/socfpga_arria10_defconfig
>>>>>>> +++ b/configs/socfpga_arria10_defconfig
>>>>>>> @@ -27,8 +27,16 @@
>>>>>>> CONFIG_MTDIDS_DEFAULT="nor0=ff705000.spi.0"
>>>>>>>  # CONFIG_EFI_PARTITION is not set
>>>>>>>  CONFIG_DEFAULT_DEVICE_TREE="socfpga_arria10_socdk_sdmmc"
>>>>>>>  CONFIG_ENV_IS_IN_MMC=y
>>>>>>> +CONFIG_SPL_ENV_SUPPORT=y
>>>>>>>  CONFIG_SPL_DM=y
>>>>>>>  CONFIG_SPL_DM_SEQ_ALIAS=y
>>>>>>> +CONFIG_SPL_DM_MMC=y
>>>>>>> +CONFIG_SPL_MMC_SUPPORT=y
>>>>>>> +CONFIG_SPL_EXT_SUPPORT=y
>>>>>>> +CONFIG_SPL_FAT_SUPPORT=y
>>>>>>> +CONFIG_SPL_DRIVERS_MISC_SUPPORT=y
>>>>>>> +CONFIG_FS_FAT_MAX_CLUSTSIZE=16384
>>>>>> This breaks systems with large FAT clusters. Why is this
>>>>>> needed
>>>>>> for
>>>>>> programming the FPGA from MMC ?
>>>>> This is final tuning in term of getting balance between
>>>>> performance
>>>>> and
>>>>> SPL image size for the socdk devkit. User can change that if
>>>>> they
>>>>> need
>>>>> large FAT cluster in their design, right?
>>>> I think it'd rather make sense to fix the FAT driver to avoid
>>>> statically
>>>> allocating those massive buffers for big clusters. I think that
>>>> can
>>>> be
>>>> done by allocating those on stack instead ... or mallocating
>>>> them.
>>> I need to explore 1st as i'm not familiar with FAT driver. Or can
>>> we
>>> temporary keeping this patch 1st until FAT issue is separately
>>> fixed?
>> Please explore this, it'll be beneficial in the long run.
> There is a progress on working to move statically allocating into
> dynamically allocation https://www.mail-archive.com/u-boot@lists.denx.d
> e/msg308353.html . 
> 
> I quickly apply the patch and having minor fixing on it. This indeed
> reduce the SPL image size, but creating overflow/corruption during
> runtime. So, the problem is still not enough memory for the SPL.
> 
> I think we can add a new SPL_FAT_WRITE config to exclude the
> fat_write.c from SPL, because most of the time, SPL needs very simple
> FAT reading. This would help us save 64KB memory space if that's
> default value for FAT cluster.
> 
> What do you think?

Sounds good.

-- 
Best regards,
Marek Vasut