Am 4. Oktober 2026 09:04:45 UTC schrieb Bin Meng <[email protected]>:
>
>The mcimx6ul-evk machine can boot Linux directly, but it cannot run the
>U-Boot proper produced by Buildroot far enough to load a kernel from its
>SD card. Early U-Boot boot test accesses currently abort or observe
>placeholder values, and the i.MX uSDHC model exposes several issues.
>
>This series lets an unmodified Buildroot 2026.05 U-Boot 2024.07 image
>run on mcimx6ul-evk, load zImage and imx6ul-14x14-evk.dtb from USDHC2,
>start Linux, mount the SD card root file system, and reach the Buildroot
>login prompt. It also documents and tests the existing direct Linux boot
>path.
>
>Patches 1 through 4 provide the minimum early-firmware-visible state.
>Patches 5 through 8 address i.MX uSDHC behavior needed by U-Boot. The
>last two patches document both boot paths and add functional tests for
>U-Boot and direct Linux boot.
>
>This series is based on:
><[email protected]>
>as the sdhci changes have conflicts.
Series applied cleanly for me onto latest master (615ece3c406b) with the
functional test passing.
Best regards,
Bernhard
>
>Changes in v3:
>- Rebase on the v3 PolarFire SoC Icicle Kit series
>- Model the full reserved page as a child of a15mpcore_priv
>- Validate MMDC RAM geometry and document supported capacities
>- Translate uSDHC vendor clock gates in its MMIO handlers
>- Cover partial reset accesses and migrate vendor clock state
>- Extend contiguous SDMA completion to both eSDHC byte orders
>
>Bin Meng (10):
> hw/cpu: a15mpcore: Model the reserved page as RAZ/WI
> hw/misc: imx6ul_ccm: Update PMU_MISC0 reset value
> hw/arm: fsl-imx6ul: Map early firmware register placeholders
> hw/arm: fsl-imx6ul: Add a minimal MMDC geometry model
> hw/sd: sdhci: Use a QEMU-local no-busy IRQ quirk bit
> hw/sd: sdhci: Honor i.MX uSDHC vendor clock gates
> hw/sd: sdhci: Preserve uSDHC status enables for U-Boot
> hw/sd: sdhci: Skip SDMA boundary stops for eSDHC and uSDHC
> docs/system/arm: Document MCIMX6UL-EVK Buildroot boot
> tests/functional/arm: Add MCIMX6UL-EVK boot tests
>
> MAINTAINERS | 1 +
> docs/system/arm/mcimx6ul-evk.rst | 72 +++++++++++
> include/hw/arm/fsl-imx6ul.h | 2 +
> include/hw/cpu/a15mpcore.h | 6 +
> include/hw/sd/sdhci.h | 10 +-
> hw/arm/fsl-imx6ul.c | 87 ++++++++++++-
> hw/arm/mcimx6ul-evk.c | 2 +
> hw/cpu/a15mpcore.c | 53 ++++++++
> hw/misc/imx6ul_ccm.c | 2 +-
> hw/sd/sdhci.c | 151 +++++++++++++++++-----
> tests/functional/arm/meson.build | 2 +
> tests/functional/arm/test_mcimx6ul_evk.py | 69 ++++++++++
> 12 files changed, 416 insertions(+), 41 deletions(-)
> create mode 100644 tests/functional/arm/test_mcimx6ul_evk.py
>
>---
>base-commit: 3ee3bacb1edd0896cb26f0f66493b4ab006fbffa
>branch: imx6ul-evk
>
