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Electro is able to boot on 15w to Depthcharge but requires 18w or above to boot to the logon screen. This patch allows 15w charger to boot Electro to Depthcharge (as before) but prevents it from booting after that unless the EC in RW negotiates with the charger and gets 18w or more. Without the patch: 1. Boot without battery 2. EC sysjumps to RW 3.a. With 18w charger, Depthcharge proceeds to boot b. With 15w charger, Depthcharge proceeds then browns out 4. Boot without battery 5. Reboot by FSP for RTC well drop 6. Charger goes to disabled state 7. EC fails to negotiate with charger, hard resets charger 8. Brownout 9. Repeat from #4 With the patch: 1. Boot without battery 2. EC sysjumps to RW 3.a. With 18w charger, Depthcharge proceeds to boot b. With 15w charger, Depthcharge times out and shuts down the system So, the outcome is same. With the patch, the user at least is (or will be) given a chance to know battery is the problem. I suppose we have to add a screen showing battery is drained or dead. I currently see no such code in vboot_select_and_load_kernel. Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org> BUG=chrome-os-partner:61801 BRANCH=none TEST=Hack the code to enforce syslock. Disconnect battery. Use 18w charger to boot the system. Use 15w charger not to boot. Change-Id: I00d79a96221f1d3b8c6d529de9b8e4588d6112aa Reviewed-on: https://chromium-review.googlesource.com/440390 Commit-Ready: Daisuke Nojiri <dnojiri@chromium.org> Tested-by: Daisuke Nojiri <dnojiri@chromium.org> Reviewed-by: Aaron Durbin <adurbin@chromium.org>