Board: StarFive VisionFive 2, revision v1.3B, 8GiB RAM variant Boot mode: SPI NOR U-Boot (recommended/supported mode, not the deprecated BootROM direct-boot)
U-Boot version: v2026.07 final release, self-built on-board (native RISC-V build) from the official u-boot-2026.07.tar.bz2 tarball + OpenSBI v1.7, built Jul 10 2026 with gcc 15.3.0 / GNU ld 2.46.50.20260617 Issue: SD card (mmc1) fails to initialize in U-Boot. Full serial output: Card did not respond to voltage select! : -110 ** Booting bootflow '<NULL>' with efi_mgr Loading Boot0000 'usb 0' failed Error reading cluster Loading Boot0001 'mmc 1' failed EFI boot manager: Cannot load any image Boot failed (err=-14) Card did not respond to voltage select! : -110 Card did not respond to voltage select! : -110 Card did not respond to voltage select! : -110 Card did not respond to voltage select! : -110 Isolation steps taken: - Reproduced identically on two different SD cards: a Samsung Pro Plus 128GB (UHS-I) and an Apacer 16GB R85 (SDHC, non-UHS) - Confirmed the cards, SD slot, and filesystem contents are all healthy: booted the Debian installer's Linux environment from USB, and it detects and cleanly mounts the same SD card's partitions (mmcblk1, mmcblk1p1-3), with valid EFI files present at correct sizes (BOOTRISCV64.EFI and grubriscv64.efi, ~156KB each) - Running `mmc info` directly at the U-Boot prompt fails outright with the same -110 error, before any filesystem access is attempted - Installing the same Debian image to a USB mass storage drive instead of SD works perfectly — boots and installs with no issues, confirming the failure is isolated specifically to the MMC/SD driver path - Also reproduced on a v2026.07-rc4 build with an identical failure, so this is not limited to a release candidate — it persists in the final v2026.07 release - Have not tested eMMC (don't have a card on hand) Expected behavior: SD card should initialize and boot normally. Booting via SPI-loaded U-Boot reading SD/eMMC as normal storage is the standard supported path on this board — only direct BootROM SD/eMMC boot (bypassing SPI U-Boot entirely) is documented as deprecated, which is not what's being used here. Happy to provide more logs, test patches, or do further research if useful. Thanks, M.H.
