diff options
| author | Aaron Durbin <adurbin@chromium.org> | 2014-11-18 11:55:33 -0600 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2015-03-21 13:42:55 +0100 |
| commit | 584e048185f2e456bc67a86cb54feac4dda8084c (patch) | |
| tree | 08f57d31ee50b64091b0e2ef189194843355893f /payloads | |
| parent | be1b4f171ec00dd636733b853f48ba537ac2fbc5 (diff) | |
libpayload arm64: don't modify cbtable entries
The framebuffer structure lives in the coreboot tables. Those
tables have a checksum calculation applied over all the entries.
Therefore, one shouldnot be modifying fields within the coreboot
table entries because the calculated checksum would be wrong.
BRANCH=none
BUG=chrome-os-partner:31936
TEST=On ryu, confirmed dev screen still works as well as cbmem utility
once booted.
Change-Id: I93830a8efe98aa848f2b0f8388688de0e93b2f82
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 6026ca5ad0254c14c30412882dc63550656c7d16
Original-Change-Id: Ic9c164ded03d10d6f6f3ce15e9b38b1f6ce61a91
Original-Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/230471
Original-Reviewed-by: Furquan Shaikh <furquan@chromium.org>
Original-Commit-Queue: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: http://review.coreboot.org/8797
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Diffstat (limited to 'payloads')
| -rw-r--r-- | payloads/libpayload/arch/arm64/mmu.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/payloads/libpayload/arch/arm64/mmu.c b/payloads/libpayload/arch/arm64/mmu.c index 41fb10b54d..86d9fc5ee5 100644 --- a/payloads/libpayload/arch/arm64/mmu.c +++ b/payloads/libpayload/arch/arm64/mmu.c @@ -675,6 +675,7 @@ static void mmu_extract_ranges(struct memrange *cb_ranges, static void mmu_add_fb_range(struct mmu_ranges *mmu_ranges) { struct mmu_memrange *fb_range; + static struct cb_framebuffer modified_fb; struct cb_framebuffer *framebuffer = lib_sysinfo.framebuffer; uint32_t fb_size; @@ -695,8 +696,16 @@ static void mmu_add_fb_range(struct mmu_ranges *mmu_ranges) if (fb_range == NULL) mmu_error(); - /* Set framebuffer address */ - framebuffer->physical_address = fb_range->base; + /* + * Set framebuffer address. However, one needs to use a freshly + * allocated framebuffer structure because the one in the coreboot + * table is part of a checksum calculation. Therefore, one cannot + * modify a field without recomputing the necessary checksum + * calcuation. + */ + modified_fb = *framebuffer; + modified_fb.physical_address = fb_range->base; + lib_sysinfo.framebuffer = &modified_fb; } /* |