[PATCH 2/2] fwu: Gracefully handle missing FWU metadata device

[Michal Simek]

On 7/2/26 10:03, Ilias Apalodimas wrote:
> On Thu, 2 Jul 2026 at 10:49, Michal Simek <michal.simek at amd.com> wrote:
>>
>>
>>
>> On 7/2/26 09:41, Ilias Apalodimas wrote:
>>> Hi Michal,
>>>
>>> On Tue, 30 Jun 2026 at 16:18, Michal Simek <michal.simek at amd.com> wrote:
>>>>
>>>> On systems with FWU enabled but without the required DT changes the FWU
>>>> metadata device is not found and fwu_boottime_checks() returns an error.
>>>> Being an initcall, that non-zero return aborts the boot flow
>>>>
>>>> Return 0 instead so the boot continues. The preceding log_err() still
>>>> tells the user that the FWU device could not be found.
>>>
>>> Won't that affect the board later on? E.g When you do capsule updates,
>>> updating the metadata will fail
>>
>> Do you mean on systems without mdata?
> 
> Yes. if the config is enabled it will make the capsule update code
> searching and updating metadata.

fwu mdata backend is not enabled hence not used. fwu just returns 0 in dump.
Updating metadata will never call any backend.

Some logs below.

Thanks,
Michal


ZYNQ GEM: f1a60000, mdio bus f1a60000, phyaddr 1, interface rgmii-id
eth0: ethernet at f1a60000
ZYNQ GEM: ed920000, mdio bus ed920000, phyaddr 0, interface 10gbase-r
, eth1: ethernet at ed920000
Cannot find fwu device
Cannot persist EFI variables without system partition
Missing TPMv2 device for EFI_TCG_PROTOCOL
Missing RNG device for EFI_RNG_PROTOCOL
Hit any key to stop autoboot: 0
versal2>
versal2> fwu
	FWU Metadata
crc32: 0x0
version: 0x0
size: 0x0
active_index: 0x0
previous_active_index: 0x0
	Image Info

Image Type Guid: 00000000-0000-0000-0000-000000000000
Location Guid: 00000000-0000-0000-0000-000000000000
Image Guid:  00000000-0000-0000-0000-000000000000
Image Acceptance: no
Image Guid:  00000000-0000-0000-0000-000000000000
Image Acceptance: no
versal2>
versal2> efidebug capsule esrt
========================================
ESRT: fw_resource_count=1
ESRT: fw_resource_count_max=1
ESRT: fw_resource_version=1
[entry 0]==============================
ESRT: fw_class=ED9E7FCF-47B3-40CD-B6E3-565F14676D82
ESRT: fw_type=system FW
ESRT: fw_version=0
ESRT: lowest_supported_fw_version=0
ESRT: capsule_flags=0
ESRT: last_attempt_version=0
ESRT: last_attempt_status=success
========================================