Re: port-arm/59558: can not boot aarch64-eb image via UEFI on QEMU

["Rin Okuyama via gnats" <gnats-admin%NetBSD.org@localhost>]

The following reply was made to PR port-arm/59558; it has been noted by GNATS.

From: Rin Okuyama <rokuyama.rk%gmail.com@localhost>
To: matthew green <mrg%NetBSD.org@localhost>, gnats-bugs%netbsd.org@localhost
Cc: port-arm-maintainer%netbsd.org@localhost, gnats-admin%netbsd.org@localhost,
 netbsd-bugs%netbsd.org@localhost
Subject: Re: port-arm/59558: can not boot aarch64-eb image via UEFI on QEMU
Date: Mon, 28 Jul 2025 17:45:47 +0900

 On 2025/07/28 17:09, matthew green wrote:
 > arm64-eb and UEFI is an unsupported combination.  the acpica code
 > is ... not ready.  it may have been once, but ACPI_BIG_ENDIAN
 > does not work last we tried.. though this:
 > 
 >> Synchronous Exception at 0x00000001384DB2F0
 > 
 > seems worse than i remember.  (perhaps it regressed even more?)
 > 
 > Rin?  you tried this recently?
 
 This is because FDT blob is not present; EDK2-based UEFI firmwares
 no longer expose FDT blob when ACPI is enabled:
 
 https://github.com/tianocore/edk2/commit/110316a995
 
 Therefore, "-machine acpi=off" or "-no-acpi" should be explicitly
 passed to qemu if arm/aarch64-eb kernel is used with UEFI firmware:
 
 https://mail-index.netbsd.org/port-arm/2025/06/30/msg009253.html
 
 Due to this "regression", big-endian kernels do not work on most
 virtualization platforms, where ACPI cannot be turned off.
 
 Thanks,
 rin
 
 > 
 > 
 > .mrg.
 >