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On x86 U-Boot cannot see the power button, which means that the EC must deal with it, and may power off the unit at any time. To get around this, we write the vbcontext every time we change it. Since this isn't a problem on ARM, and we want to avoid spurious writes (due to delay and disk wear), make this code execute only on x86 machines. BUG=chrome-os-partner:13717 BUG=chrome-os-partner:7689 BRANCH=snow,link TEST=manual On snow, see that the EC no longer gets MKBP messages to write the nv context. On link, manually add a print to U-Boot's nvstorage_write_disk() function and see that changing language in recovery still causes a write. Change-Id: I62508739c9fc3aca46fba58b196a8af45269af2a Reviewed-on: https://gerrit.chromium.org/gerrit/32464 Commit-Ready: Tom Wai-Hong Tam <waihong@chromium.org> Reviewed-by: Tom Wai-Hong Tam <waihong@chromium.org> Tested-by: Tom Wai-Hong Tam <waihong@chromium.org>
arch/ is stuff that defines the architecture-dependent information (only used in firmware build mode). lib/ is stuff that the BIOS needs to link with. stub/ is stuff to be implemented by the BIOS. include/ describes the interfaces between the two parts.