kernel, chromeos-initramfs: overhaul for recovery support

chromeos-base/kernel/kernel-9999.ebuild

 # Copyright (c) 2009 The Chromium OS Authors. All rights reserved.
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=2
 CROS_WORKON_COMMIT="4ef19b8f1d53ab28ba9dc76de832b1f874a32dcf"
 inherit toolchain-funcs
 
 DESCRIPTION="Chrome OS Kernel"
 HOMEPAGE="http://src.chromium.org"
 LICENSE="GPL-2"
@@ skipping 64 matching lines @@
         yes "" | emake ARCH=${kernel_arch} oldconfig || die
 
         if use compat_wireless; then
                 "${S}"/chromeos/scripts/compat_wireless_config "${S}"
         fi
 }
 
 src_compile() {
         if use initramfs; then
                 INITRAMFS="CONFIG_INITRAMFS_SOURCE=${ROOT}/usr/bin/initramfs.cpio.gz"
+                # We want avoid copying modules into the initramfs so we need to enable
+                # the functionality required for the initramfs here.
+
+                # TPM support to ensure proper locking.
+                INITRAMFS="$INITRAMFS CONFIG_TCG_TPM=y CONFIG_TCG_TIS=y"
+
+                # VFAT FS support for EFI System Partition updates.
+                INITRAMFS="$INITRAMFS CONFIG_NLS_CODEPAGE_437=y"
+                INITRAMFS="$INITRAMFS CONFIG_NLS_ISO8859_1=y"
+                INITRAMFS="$INITRAMFS CONFIG_FAT_FS=y CONFIG_VFAT_FS=y"
         else
                 INITRAMFS=""
         fi
         emake \
                 $INITRAMFS \
                 ARCH=${kernel_arch} \
                 CROSS_COMPILE="${cross}" || die
 
         if use compat_wireless; then
                 # compat-wireless support must be done after
@@ skipping 61 matching lines @@
                         -O linux \
                         -T kernel \
                         -C none \
                         -a ${vmlinux_text_base} \
                         -e ${vmlinux_text_base} \
                         -n kernel \
                         -d "${D}"/boot/vmlinuz \
                         "${D}"/boot/vmlinux.uimg || die
         fi
 }