Enable UBI support for a platform

[Kun Zhao]

On 9/5/20 5:49 AM, Deepak Kodihalli wrote:
> Hi Kun,
>
> On 05/09/20 5:32 am, Kun Zhao wrote:
>> Hi Team,
>>
>> My platform is based on ast2500, and I’ve already been able to built out the ubi image. But when I tried to test it with qemu, it just stopped at u-boot because ‘can’t get kernel image,
>>
>> qemu-system-arm: Aspeed iBT has no chardev backend
>>
>> U-Boot 2016.07 (Sep 04 2020 - 19:47:48 +0000)
>>
>>         Watchdog enabled
>>
>> DRAM:  496 MiB
>>
>> Flash: 32 MiB
>>
>> *** Warning - bad CRC, using default environment
>>
>> In:    serial
>>
>> Out:   serial
>>
>> Err:   serial
>>
>> Net:   MAC0 : RGMII
>>
>> MAC1 : RGMII
>>
>> FTGMAC100#0
>>
>> Error: FTGMAC100#0 address not set.
>>
>> , FTGMAC100#1
>>
>> Error: FTGMAC100#1 address not set.
>>
>> Hit any key to stop autoboot:  0
>>
>> Wrong Image Format for bootm command
>>
>> ERROR: can't get kernel image!
>>
>> ast#
>>
>> And I found the bootargs is not right,
>>
>> ast# print
>>
>> baudrate=115200
>>
>> bootargs=console=ttyS4,115200n8 root=/dev/ram rw
>>
>> bootcmd=bootm 20080000
>>
>> bootdelay=2
>>
>> Checked in the build folder for tmp/work/myplatform-openbmc-linux-gnueabi/u-boot-aspeed/1_v2016.07+gitAUTOINC+1ded9fa3a2-r0/ and found the none of the following patches are there,
>>
>> 0002-config-ast-common-hack-bootopts.patch
>>
>> 0003-config-ast-common-Add-bootopts-to-support-ubi-and-mt.patch
>>
>> 0004-config-ast-common-Add-conditional-factory-reset-comm.patch
>>
>> 0005-config-ast-common-Fall-back-to-secondary-flash-on-fa.patch
>>
>> I think that’s why the bootargs is not correct.
>>
>> This is the details of how I enabled the ubi support in my platform recipes,
>>
>> 1. In meta-myplatform/conf/distro/openbmc-myplatform.conf, I added,
>>
>> require conf/distro/include/phosphor-base.inc
>>
>> require conf/distro/include/phosphor-ubi.inc
>
> You should just need the one line above, plus a device tree change for your system. The default openbmc-flash-layout.dtsi doesn't make a ubifs partition. You can for eg look at witherspoon's dts, which uses ubifs.
Hi Deepak, thank you for reply. I've tried to use the witherspoon's flash layout per your tips here. But it still stops at u-boot with "can't get kernel image!" error. Do I need to enable any kernel config options?
>
> Does anyone know why the default is static partitions, and not ubifs?
>
> Regards,
> Deepak
>
>> 2. In meta-myplatform/conf/machine/myplatform.conf, I added,
>>
>> IMAGE_FSTYPES += " mtd-ubi mtd-ubi-tar"
>>
>> OBMC_MACHINE_FEATURES += " obmc-ubi-fs"
>>
>> Do I miss anything?
>>
>> Thanks.
>>
>> Best regards,
>>
>> Kun Zhao
>>
>> /*
>>
>> zkxz at hotmail.com <mailto:zkxz at hotmail.com>
>>
>> */
>>
>
Kun