Re: [edk2-devel] [EDK2 / UEFI]: Support for flashing ubi-volume using fastboot

["Andrew Fish" <afish@apple.com>]

> On Apr 14, 2021, at 11:12 AM, Pintu Agarwal <pintu.ping@gmail.com> wrote:
> 
> Hi,
> 
> I am new to EDK2 and UEFI.
> I am working on an ARM32 embedded Linux board that supports NAND and UBI images.
> I have several partitions in my system images, and some partitions
> have sub-volumes.
> I am looking for help on how to support flashing ubi-volumes directly
> using the fastboot flash method.
> 
> I see that our EDK2 does not have a mechanism to flash ubi-volumes.
> But the underlying UEFI code, have support for ubi-volume.
> {{{
> UEFI Code flow:
> ubi_flasher_write(...)
> {
> [...]
>        if (hdl->is_it_volume) {
>                result = ubi_flasher_vol_write(hdl);
>                if (result != 0)
>                        goto End;
>        } else {
>                result = ubi_flasher_ubi_write(hdl);
>                if (result != 0)
>                        goto End;
>        }
> [...]
> }
> }}}
> 
> When I tried to invoke ubi_flasher_write from EDK2, by passing the
> ubifs volume name, instead of PartitionName, it does not work (crash).
> 

EFI does not have a concept of Volume names, EFI has a concept of EFI_HANDLEs that contain device paths that indentify the volume. 

The UEFI Shell has volume names, but that is a construct produced by the UEFI Shell. 

Thanks,

Andrew Fish

> Thus I am wondering, what needs to done at EDK2 (and how) to invoke
> this ubi volume write at uefi.
> Or, is there some functionality missing at the UEFI layer itself ?
> 
> Please provide some suggestions on this.
> 
> Thanks,
> Pintu
> 
> 
> 
> 
>