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

[Zixing Liu]

Hi Heinrich,

>+u-boot (2024.01+dfsg-1ubuntu5.2) noble; urgency=medium
>+
>+  * Fix parsing of RISC-V ISA extensions (LP: #2098421)
>+
>+ -- Heinrich Schuchardt <heinrich.schuchardt at canonical.com>  Thu, 13 Feb 2025 23:38:08 +0100

Can you expand this changelog so that SRU developers can understand your
changes better (maybe add something like "Fix RISC-V ISA extensions
parsing logic by back-porting several upstream patches")

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

Status in u-boot package in Ubuntu:
  Confirmed
Status in u-boot source package in Noble:
  Confirmed
Status in u-boot source package in Oracular:
  Confirmed
Status in u-boot source package in Plucky:
  Confirmed

Bug description:
  [ 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

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