mirror of
https://github.com/Telecominfraproject/OpenCellular.git
synced 2025-12-28 02:35:28 +00:00
fa76d68ce9
The console task should be higher priority than the host command task,
since that allows debugging problems with host commands.
The keyboard scanning task should be higher priority than both of
them, since it's extremely latency-sensitive. As currently written,
long-running host commands such as I2C passthru can interfere with
keyboard scanning.
BUG=chrome-os-partner:22681
BRANCH=none (potentially affects pit, but apparently not noticeably)
TEST=type bursts of 6-8 characters quickly while doing a flash update
of the EC; should not drop characters.
Change-Id: I48db014053750a5f1fae5d06df34768975bb8297
Reviewed-on: https://chromium-review.googlesource.com/169334
Tested-by: Randall Spangler <rspangler@chromium.org>
Reviewed-by: Bill Richardson <wfrichar@chromium.org>
Commit-Queue: Randall Spangler <rspangler@chromium.org>
In the most general case, the flash layout looks something like this: +---------------------+ | Reserved for EC use | +---------------------+ +---------------------+ | Vblock B | +---------------------+ | RW firmware B | +---------------------+ +---------------------+ | Vblock A | +---------------------+ | RW firmware A | +---------------------+ +---------------------+ | FMAP | +---------------------+ | Public root key | +---------------------+ | Read-only firmware | +---------------------+ BIOS firmware (and kernel) put the vblock info at the start of each image where it's easy to find. The Blizzard EC expects the firmware vector table to come first, so we have to put the vblock at the end. This means we have to know where to look for it, but that's built into the FMAP and the RO firmware anyway, so that's not an issue. The RO firmware doesn't need a vblock of course, but it does need some reserved space for vboot-related things. Using SHA256/RSA4096, the vblock is 2468 bytes (0x9a4), while the public root key is 1064 bytes (0x428) and the current FMAP is 644 bytes (0x284). If we reserve 4K at the top of each FW image, that should give us plenty of room for vboot-related stuff.