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The host should be responsible for setting any required charge throttling at resume. EC the should not restore the previous charge current limit as the the charging and thermal state of the device are likely to be different when the device resumes. BUG=chrome-os-partner:27369 BRANCH=ToT TEST=Suspend the device with the adapter unplugged. Plug in the adapter and resume. Verify that the charging LED doesn't flash two or three times at resume. (tested on squawks) Change-Id: I1fbba0652419501193e713e130830a005c6b5a22 Origianl-Change-Id: I1e4615d99ee9a386b25e58b991e846c5d2beaa39 Signed-off-by: Dave Parker <dparker@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/192686 Reviewed-by: Randall Spangler <rspangler@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/193341 Reviewed-by: Bill Richardson <wfrichar@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.