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2ce1cdcd8e
Every SD write failed. The card took the write command and went to receive-data state, but never saw the block: CMD12 still found it there, and the controller reported a missing CRC status after each block, 20 retries over. Reads worked. Stress-tested over USB mass storage on a generic rk2705, with a SDHC card, in the normal firmware and in the bootloader alike. sd_init_card() switched the card to high-speed mode with CMD6. This host is an SD 1.01 controller with a card clock of at most 25 MHz, per the rk27xx datasheet; high speed and CMD6 came with SD 1.10, and a card switched to it evidently does not take the data this host drives. The original firmware never switches: after selecting the card it sets the block length and a 1-bit bus and stays at default speed. A slower card clock did not help; dropping the switch alone did. Leave the card at default speed. Tested on a generic rk2705: ums_stress.py over a 32 MiB window of the card - fill, verify, edge sizes, a mixed read/write soak - passes at 2.3 MB/s writing and reading, about 75% of what a 1-bit bus at 25 MHz carries. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Change-Id: Icfafab0bb460c8c0fda3dea455df9a36622bf764 |
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