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rockbox/firmware
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Marcin Bukat 0e1952a4d1 rk27xx: invalidate the cache with the cache controller off 
commit_discard_idcache() invalidated both cache ways while running from
cached SDRAM. When the loop polling for the invalidate to finish starts on
a cache line of its own, it is fetched through the ways being invalidated
and the CPU takes a data abort, reported at the loop's branch. Whether it
crashed thus depended on where the linker put the function.

usb_storage calls it on every USB connect. On rk27generic a jpeg change
that grew clip_jpeg_fd by 8 bytes moved the loop onto a new line, and the
firmware crashed as the USB screen came up, with an empty backtrace.

Turn the cache controller off around the invalidate, as crt0.S does at
start-up. The cache is write-through, so no data is lost.

Tested on a generic rk2705 with the function padded so the poll loop starts
a new cache line: without this change it crashes at the first USB connect,
with it the device enumerates as a mass storage device. The normally
linked build works too.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Change-Id: I319b811fdef30717999b60132000e70f410001fc
2026-09-30 16:47:48 +02:00
..
asm asm: ARMv7-M: replace unity-gain write_samples() asm with memcpy 2026-07-15 22:56:05 -04:00
common Add "rbfs" prefix to native filesystem functions 2026-09-17 16:22:31 -04:00
drivers rk27xx codec: mix in only the tuner's line, keep the DAC 2026-09-30 08:07:15 -04:00
export rk27generic: FM radio screen keys, tuner noted as an RDA5807P 2026-09-30 08:07:47 -04:00
include Add "rbfs" prefix to native filesystem functions 2026-09-17 16:22:31 -04:00
kernel 3ds: Port refactor. 2026-09-01 08:39:07 -04:00
libc chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
reggen stm32h743: implement timer API 2026-07-11 17:23:36 -04:00
target rk27xx: invalidate the cache with the cache controller off 2026-09-30 16:47:48 +02:00
usbstack rk27xx: keep interrupt and bulk endpoints in separate groups 2026-09-28 16:55:21 +02:00
arabjoin.c
arabjoin.h unicode: Support characters beyond the first unicode plane 2025-09-12 09:24:30 -04:00
ata_idle_notify.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
backlight-sw-fading.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
backlight.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
bidi.c bidi: do not pass non-ASCII codepoints to ispunct() 2026-07-01 21:03:38 -04:00
buflib_malloc.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
buflib_mempool.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
chunk_alloc.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
COPYING
core_alloc.c Fix building Warble when configured as the iPod Video 2026-08-25 08:01:09 -04:00
debug.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
eeprom_settings.c firmware: move iriver flash helper functions into target tree 2026-09-23 13:44:45 -04:00
elf_loader.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
enc_base.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
events.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
firmware.make chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
font.c Add "rbfs" prefix to native filesystem functions 2026-09-17 16:22:31 -04:00
font_cache.c unicode: Support characters beyond the first unicode plane 2025-09-12 09:24:30 -04:00
general.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
hangul.c unicode: Support characters beyond the first unicode plane 2025-09-12 09:24:30 -04:00
lc-rock.c Add "rbfs" prefix to native filesystem functions 2026-09-17 16:22:31 -04:00
linuxboot.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
logf.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
lru.c
panic.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
pcm.c pcm_sink: allow per-sink swvol/hwvol selection 2026-08-14 22:39:13 +09:00
pcm_mixer.c pcm_mixer: fix active_channels handling in mixer_handle_sampr_change 2026-07-23 21:17:13 -04:00
pcm_sampr.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
pcm_sw_volume.c swvol: Switch to using WANT_SWVOL_32 in pcm_sw_volume.c 2026-08-14 22:45:14 -04:00
powermgmt.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
profile.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
README
rolo.c ROLO: Get rid of redundant call to audio_hard_stop() 2026-09-23 16:52:01 -04:00
rom.lds h300: add support for ROM image generation 2020-10-26 01:37:42 +00:00
screendump.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
scroll_engine.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
sdmmc.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
sound.c audiohw: remove unused BALANCE_CAP and CLIPPING_CAP 2026-07-20 12:47:12 -04:00
SOURCES YP-CP3: Si4703 FM radio 2026-09-29 09:47:51 +02:00
storage.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
system.c firmware: move iriver flash helper functions into target tree 2026-09-23 13:44:45 -04:00
timer.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
tuner.c chore: Get rid of *all* vestigal CVS '$Id:$' tags 2026-06-01 16:01:18 -04:00
usb.c FS#14011: Handle usb hosts whose first request is SET_ADDRESS (Anthony Fletcher) 2026-09-27 19:36:21 -04:00

README 

See docs/README