is_erased can be one of -1, 0, or 1 so it must not be checked like a boolean value. In this case we want to erase a page unless we know it's already erased so we just check for is_erased != 1. Thanks to Jim Paris for pointing this out on another driver. Change-Id: I4591186228153b64e5a9608a2aac18745e578d4a Signed-off-by: Andrey Yurovsky <yurovsky@gmail.com> Reviewed-on: http://openocd.zylin.com/2368 Tested-by: jenkins Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>tags/v0.9.0-rc1