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ecc0036470
The bootrom flash functions reset the QMI window 1 (chip select 1) registers and the QSPI pads. flash_flush_cache() also discards dirty XIP cache lines. The flash MTD driver did not save anything, so after the first erase or program the PSRAM on chip select 1 read garbage, and PSRAM writes still in the cache were lost. Do what the Pico SDK hardware_flash library does: - Clean the XIP cache before the operation. Clean by set/way through the top of the maintenance window, to avoid erratum RP2350-E11. - Save the QSPI pads and the five QMI M1 registers before, and write them back after XIP is restored. Also keep XIP_CTRL.WRITABLE_M1. rp23xx_psram_restore() was the earlier fix for this, but nothing called it. Remove it. Assisted-by: Claude Code:claude-opus-5-5 Signed-off-by: Marco Casaroli <marco.casaroli@gmail.com> |
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