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Date:   Sat, 21 Oct 2023 02:07:56 +0200 (CEST)
From:   Ben Schneider <ben@bens.haus>
To:     Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Cc:     Regressions <regressions@lists.linux.dev>,
        Linux Efi <linux-efi@vger.kernel.org>,
        Stable <stable@vger.kernel.org>,
        Ard Biesheuvel <ardb@kernel.org>,
        Ilias Apalodimas <ilias.apalodimas@linaro.org>
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Subject: Re: [REGRESSION] boot fails for EFI boot stub loaded by u-boot
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Oct 20, 2023, 01:25 by ben@bens.haus:

> Oct 19, 2023, 07:21 by heinrich.schuchardt@canonical.com:
>
>> Compiling upstream U-Boot's qemu_arm64_defconfig yields lib/efi_loader/dtbdump.efi. If you run this instead of the kernel, you can write the device-tree as it is passed in a configuration table to the ESP.
>>
> I compiled and ran this fine, but I was unable to save the device tree. I suspect this is because the program searches for an ESP, and there is none on the device. U-boot was compiled with support to load directly from an ext4 filesystem so I didn't bother setting one up. I will work on it. 
>
Hi Heinrich, I loaded dtbdump.efi from a FAT32 formatted partition with type EFI System, but attempts to run the save command return "Failed to open simple file system protocol". Sorry if there is something else I am missing.

Ben