Using USB Mass Storage on AM335X

[Lukasz Majewski]

Hi Lokesh, Otavio,

> + 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 :).

IIRC there were some attempts to port gadget infrastructure to SPL for
the TI SoCs. As pointed out above - it may happen that
CONFIG_CMD_USB_MASS_STORAGE implicitly enables some other option in
Kconfig, which also enables some SPL initialization for gadgets.

The other option would be to check if the SPL malloc space is enough to
handle allocations for gargets (as pointed out above).

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

And yes, JTAG debugger would help.

> 
> Thanks and regards,
> Lokesh




Best regards,

Lukasz Majewski

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