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c3a62cee96
Before it jumps to an image, the rk27xx NAND bootloader writes three words at the address in RKW header field 0x14: a magic, its version and which copy of the image it loaded. The original firmware never initialises them: it reports the version over USB and counts its own reboots in the third word, and once the count reaches 5 it reboots into a mode the NAND bootloader will not boot. When our bootloader started the OF, nothing wrote them, so the OF ran with whatever was left in DRAM. Field 0x14 of our own images held a constant taken from some other image. Point it at the last 12 bytes of DRAM, which nothing uses before our bootloader runs. load_rkw() in the bootloader now reads the words there before loading an image, and writes them at the address in the loaded image's header when that lies between the image and the bootloader. Started over USB, it passes version 0. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Change-Id: Ife1d63e361a780c28a9f0626d110552b98bb6b7f |
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