Re: Hints on how to use efi_driver/efi_block_device.c

[AKASHI Takahiro <takahiro.akashi@linaro.org>]

On Thu, Aug 12, 2021 at 04:34:01PM +0200, Christian Melki wrote:
> I was hoping that U-boot would detect BLOCK_IO devices provided by UEFI
> automatically. But I can't see anything attached under lsblk or find some
> other information about this.

I'm not sure what you intend to do here, but please try
the commands, "efidebug devices" and/or "efidebug dh"
to find out what you're looking for.

Please note that you have to enumerate (block) devices
in advance with, say, "mmc rescan", "scsi scan" (and
probably "virtio scan" as well).

-Takahiro Akashi

> For example, Barebox works just fine on both Virtualbox and real hardware in
> this regard.
> 
> Barebox does not have an emmc driver for the real hardware but piggybacks
> off the UEFI protocol for this.
> 
> I'm sure that the idea with this U-boot driver is something like that, but
> would appreciate some hints on how to use it.
> 
> Ie, standard usage. UEFI boots of a drive, posts some handles(?) to a block
> device and U-boot picks it up, not knowing more about the abstracted
> hardware.
> 
> Best regards,
> Christian