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The EC and host have different ways of computing and presenting the battery charge level. This change adjusts the charge levels at which the charging LED indicates a full and low battery to match what is presented to the user in the host UI. BUG=chrome-os-partner:27743,chrome-os-partner:27746 BRANCH=rambi,tot TEST=Run "battfake 91" which charging, verify charging LED turns green and the UI reports 95%. Run "battfake 13" while discharging, verify charging LED blinks amber (1 sec on, 1 sec off) and the UI reports 10%. Change-Id: Iaffffb57a7fbfd14ebb90363cbd4aa1a9becf022 Original-Change-Id: I203c90a65e4aa2907a14077a9276674ecfa292f2 Signed-off-by: Dave Parker <dparker@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/194347 Reviewed-by: Randall Spangler <rspangler@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/195848
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.