[PATCH 00/10] hw/arm: Enable U-Boot boot on MCIMX6UL-EVK

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.


Bin Meng (10):
  hw/arm: fsl-imx6ul: Add SCU compatibility window
  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 i.MX 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          | 67 +++++++++++++++++
 hw/arm/fsl-imx6ul.c                       | 87 +++++++++++++++++++++-
 hw/arm/mcimx6ul-evk.c                     |  2 +
 hw/misc/imx6ul_ccm.c                      |  2 +-
 hw/sd/sdhci.c                             | 89 +++++++++++++++++++----
 include/hw/arm/fsl-imx6ul.h               |  2 +
 include/hw/sd/sdhci.h                     | 15 +++-
 tests/functional/arm/meson.build          |  2 +
 tests/functional/arm/test_mcimx6ul_evk.py | 70 ++++++++++++++++++
 10 files changed, 315 insertions(+), 22 deletions(-)
 create mode 100644 tests/functional/arm/test_mcimx6ul_evk.py

---
base-commit: e8d693e12af9cbb89d724baadfcc08559669e279
branch: imx6ul-evk

-- 
2.53.0