[PATCH v2 2/4] mx6cuboxi: customize board_boot_order to access eMMC

Walter Lozano walter.lozano at collabora.com
Mon Mar 16 18:53:58 CET 2020

Hi Baruch,

On 16/3/20 14:25, Baruch Siach wrote:
> Hi Walter
> On Mon, Mar 16, 2020 at 02:05:57PM -0300, Walter Lozano wrote:
>> On 16/3/20 13:28, Baruch Siach wrote:
>>> On Thu, Mar 12, 2020 at 01:52:13PM -0300, Walter Lozano wrote:
>>>> Thanks for sharing.
>>>> On 12/3/20 02:02, Baruch Siach wrote:
>>>>> Hi Walter,
>>>>> On Wed, Mar 11 2020, Walter Lozano wrote:
>>>>>> In SPL legacy code only one MMC device is created, based on BOOT_CFG
>>>>>> register, which can be either SD or eMMC. In this context
>>>>>> board_boot_order return always MMC1 when configure to boot from
>>>>>> SD/eMMC. After switching to DM both SD and eMMC devices are created
>>>>>> based on the information available on DT, but as board_boot_order
>>>>>> only returns MMC1 is not possible to boot from eMMC.
>>>>>> This patch customizes board_boot_order taking into account BOOT_CFG
>>>>>> register to point to correct MMC1 / MMC2 device. Additionally, handle
>>>>>> IO mux for the desired boot device.
>>>>>> Signed-off-by: Walter Lozano <walter.lozano at collabora.com>
>>>>>> ---
>>>>>>     board/solidrun/mx6cuboxi/mx6cuboxi.c | 49 ++++++++++++++++++++++++++++
>>>>>>     1 file changed, 49 insertions(+)
>>>>>> diff --git a/board/solidrun/mx6cuboxi/mx6cuboxi.c b/board/solidrun/mx6cuboxi/mx6cuboxi.c
>>>>>> index 6a96f9ecdb..9bf3645f72 100644
>>>>>> --- a/board/solidrun/mx6cuboxi/mx6cuboxi.c
>>>>>> +++ b/board/solidrun/mx6cuboxi/mx6cuboxi.c
>>>>>> @@ -435,6 +435,7 @@ int board_early_init_f(void)
>>>>>>     #ifdef CONFIG_CMD_SATA
>>>>>>     	setup_sata();
>>>>>>     #endif
>>>>>> +
>>>>> This hunk should not be part of this commit.
>>>> Thanks for pointing to this silly hunk. I will prepare a V3.
>>>>> Looks good to me, otherwise.
>>>>> I can't test at the moment. Have you tested boot from both SD card and eMMC?
>>>> Most of the work was done booting from SD. In order to test booting from
>>>> eMMC, as I have some specific eFUSE configs, I tweaked board_boot_order to
>>>> force booting from eMMC.
>>> But that does not cover SPL boot from eMMC, right?
>> Basically I think this approach should cover the necessary steps. To be more
>> clear about my tweak
>> 1- BootROM loads SPL from SD
>> 2- SPL is tweaked to load U-Boot from eMMC, and in this way test its support
>> on SPL
> This is not exactly the same as SPL boot from eMMC. For example, your scenario
> would work even without 'u-boot,dm-pre-reloc' property in the eMMC device
> node.

I agree, it is not exactly the same and I really appreciate the time you 
spent testing it. However I still don't understand your comments 
regarding 'u-boot,dm-pre-reloc', as without this property there wouldn't 
be a usdhc3 node in the DTB for SPL. Could you please clarify?

>>> Anyway I tested your patches here on real hardware with unfused SOM and
>>> SD/eMMC boot select jumpers.
>> Thank you much for taking the time to test these patches in you board. I
>> really appreciate your help
>>> Tested-by: Baruch Siach <baruch at tkos.co.il>
>> Thanks. I'll add the tag to the v3.
> I think this series ready as is. No need to post v3 just for the test tag.
> Patchwork collects patch tags automatically. See under the 'A/F/R/T' column
> here:
>    http://patchwork.ozlabs.org/project/uboot/list/?series=163738

I see, thanks for clarifying the issue related to "Tested-by" tag. Sorry 
for asking but, is it not necessary to send a v3 to avoid the "silly 
hunk" you pointed me?



> baruch

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