This patch adds support for handling ACS (the alternate/special graphics character set) both on VGA and serial console in libpayload. It also updates coreinfo to use the ACS_ macros for line graphics.
Build tested against svn HEAD. To actually get any output, the previously sent libpayload-kconfig patch, or equivalent, is needed too. Runtime tested with coreboot-v3 in QEMU.
/ulf