[Bug 2098421] [NEW] [SRU] U-Boot 2024.01 fails to boot on RISC-V with QEMU 9.0 and cpu=max

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[ Impact ]

RISC-V device-trees have moved to using riscv,isa-extensions instead of
riscv,isa. If riscv,isa is missing, U-Boot 2024.01 fails to boot. This
can be demonstrated with QEMU 9.0 and cpu=max.

The following patches provide a remedy:

0d95add3b1c7 ("riscv: cpu: improve multi-letter extension detection in supports_extension()"
b90edde70127 ("riscv: don't read riscv, isa in the riscv cpu's get_desc()")
f39b1b77d822 ("riscv: support extension probing using riscv, isa-extensions")

[Test Plan ]

With QEMU 9.0 installed run:

qemu-system-riscv64 -M virt -cpu max \
-kernel /usr/lib/u-boot/qemu-riscv64_smode/uboot.elf

For regression testing:

Install u-boot-sifive on the Unmatched board and boot.
Install u-boot-microchip on the Icicle board and boot.
Install u-boot-starfive on the VisionFive 2 board and boot.

[ Where problems could occur ]

Booting on QEMU or real hardware might fail if the implementation of ISA
string parsing were incorrect.

[ Other Info ]

n/a

** Affects: u-boot (Ubuntu)
     Importance: Undecided
     Assignee: Dave Jones (waveform)
         Status: New

** Affects: u-boot (Ubuntu Noble)
     Importance: Undecided
     Assignee: Heinrich Schuchardt (xypron)
         Status: New

** Affects: u-boot (Ubuntu Oracular)
     Importance: Undecided
     Assignee: Heinrich Schuchardt (xypron)
         Status: New

** Affects: u-boot (Ubuntu Plucky)
     Importance: Undecided
     Assignee: Dave Jones (waveform)
         Status: New


** Tags: patch
-- 
[SRU] U-Boot 2024.01 fails to boot on RISC-V with QEMU 9.0 and cpu=max
https://bugs.launchpad.net/bugs/2098421
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