gowin: fix GW5A external flash writes being erased by hardware auto-erase

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The Reinit command (0x3F) sent in gw5a_enable_spi() triggers a
hardware-initiated bulk erase of the external SPI flash (status register
bit 31 'auto_erase'). The code previously proceeded immediately to flash
programming, creating a race condition where the ongoing background
erase would corrupt or wipe written data.

Fix by polling the status register after Reinit until the auto_erase bit
clears before continuing with SPI bridge setup and flash operations.

Also reset the SPI flash chip in programExtFlash() before releasing the
JTAG-SPI bridge, ensuring the flash is in standard SPI mode for the
hardware boot loader.

Tested on GW5AT-15 (idcode 0x0001681b) with XTX XT25F128B flash.

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This commit is contained in:

key2 2026-04-04 19:03:36 +02:00

parent 816d6558fe

commit 18c37faeda

1 changed files with 1 additions and 1411 deletions

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