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Since the length of flash-write function used by host command is not aligned to 256 bytes, we need to split it into several sequences to make sure it won't exceed page buffer size of flash. Add i2c stop condition checking to avoid unnecessary i2c unwedge operations. We found some battery will held scl for a while and master cann't issue stop condition immediately. Modified drivers: 1. flash.c: Add support for sequence programing. 2. i2c.c: Add i2c stop condition checking mechanism. 3. i2c.c: Fixed bug of i2c_is_raw_mode. (wrong bit offset) BUG=chrome-os-partner:34346 TEST=make buildall -j; test nuvoton IC specific drivers BRANCH=none Change-Id: I4f35a617466ba37bcc4e3aa5324c8950f824a4c2 Signed-off-by: Ian Chao <mlchao@nuvoton.com> Reviewed-on: https://chromium-review.googlesource.com/295662 Commit-Ready: Mulin Chao <mlchao@nuvoton.com> Tested-by: Mulin Chao <mlchao@nuvoton.com> Reviewed-by: Randall Spangler <rspangler@chromium.org> Reviewed-by: Shawn N <shawnn@chromium.org>