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From: Pintu Agarwal <pintu.ping@gmail.com>
Date: Wed, 14 Apr 2021 23:42:16 +0530
Message-ID: <CAOuPNLiz4DA+uuLC97g_dvJN-iPK+x4GTtrq+Ev-MVoFUBOQaw@mail.gmail.com>
Subject: [EDK2 / UEFI]: Support for flashing ubi-volume using fastboot
To: edk2-devel@lists.01.org, devel@edk2.groups.io
Content-Type: text/plain; charset="UTF-8"

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).

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