Using USB Mass Storage on AM335X

[Lokesh Vutla]

+ Pratyush

On 30/10/20 11:36 am, Heiko Schocher wrote:
> Hello Otavio,
> 
> Am 29.10.2020 um 23:19 schrieb Otavio Salvador:
>> Hi,
>>
>> I am working on porting mainline U-Boot to a custom AM335X board that
>> only has eMMC as the boot medium.
>>
>> I can load U-Boot via serial boot and flash MLO and u-boot.img into
>> the eMMC using DFU. Then the board boots successfully via eMMC.
>>
>> Now I want to run the "ums" command to be able to mount the eMMC on
>> the host. The problem I am getting is that when I select
>> CONFIG_CMD_USB_MASS_STORAGE=y the board no longer boots.
>>
>> Does anyone know why selecting CONFIG_CMD_USB_MASS_STORAGE=y causes
>> the board to not boot anymore?
> 
> Not really ... I cannot see, which impact activating this command
> has with not booting ...
> 
> May some problem with image size? Early malloc space, some addresses
> which now overlap?

Good point. Just to avoid this scenario, can you make sure UMS is enabled only
in U-Boot and not in SPL? or you can try with old MLO with new U-Boot :).

As Heiko already asked, can you provide more details in the failing scenario?

Thanks and regards,
Lokesh