soc/intel/elkhartlake/bootblock: Do initial SoC commit until bootblock

Clone entirely from Jasperlake

This patch is based on TGL_upstream series patches:
https://review.coreboot.org/c/coreboot/+/36550

List of changes on top off initial jasperlake clone
1. Replace "Jasperlake" with "Elkhartlake"
2. Replace "jsl" with "ehl"
3. Rename structure based on Jasperlake with Elkhartlake
6. Add required headers into include/soc/ from JSL directory

Elkhart Lake specific changes will follow in subsequent patches.
1. soc/intel/elkhartlake: Update Kconfig

Signed-off-by: Tan, Lean Sheng <lean.sheng.tan@intel.com>
Change-Id: I9f91c1efa81a358b1f59e032e209e07b62d54613
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44799
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Maulik V Vaghela <maulik.v.vaghela@intel.com>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/src/soc/intel/elkhartlake/bootblock/cpu.c b/src/soc/intel/elkhartlake/bootblock/cpu.c
new file mode 100644
index 0000000000..bbce44cd60
--- /dev/null
+++ b/src/soc/intel/elkhartlake/bootblock/cpu.c
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <intelblocks/fast_spi.h>
+#include <soc/bootblock.h>
+
+void bootblock_cpu_init(void)
+{
+	/*
+	 * Elkhartlake platform doesn't support booting from any other media
+	 * (like eMMC on APL/GLK platform) than only booting from SPI device
+	 * and on IA platform SPI is memory mapped hence enabling temporarily
+	 * caching on memory-mapped spi boot media.
+	 */
+	fast_spi_cache_bios_region();
+}