x86: fsp: Allow skipping init code when chain loading

It is useful to be able to boot the same x86 image on a device with or
without a first-stage bootloader. For example, with chromebook_coral, it
is helpful for testing to be able to boot the same U-Boot (complete with
FSP) on bare metal and from coreboot. It allows checking of things like
CPU speed, comparing registers, ACPI tables and the like.

When U-Boot is not the first-stage bootloader much of this code is not
needed and can break booting. Add checks for this to the FSP code.

Rather than checking for the amount of available SDRAM, just use 1GB in
this situation, which should be safe. Using 2GB may run into a memory
hole on some SoCs.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

4 files changed, 22 insertions, 1 deletions

diff --git a/arch/x86/lib/fsp/fsp_dram.c b/arch/x86/lib/fsp/fsp_dram.c
index 9ce0ddf0d3..15e82de2fe 100644
--- a/arch/x86/lib/fsp/fsp_dram.c
+++ b/arch/x86/lib/fsp/fsp_dram.c
@@ -44,6 +44,14 @@ int dram_init_banksize(void)
 	phys_addr_t low_end;
 	uint bank;
 
+	if (!ll_boot_init()) {
+		gd->bd->bi_dram[0].start = 0;
+		gd->bd->bi_dram[0].size = gd->ram_size;
+
+		mtrr_add_request(MTRR_TYPE_WRBACK, 0, gd->ram_size);
+		return 0;
+	}
+
 	low_end = 0;
 	for (bank = 1, hdr = gd->arch.hob_list;
 	     bank < CONFIG_NR_DRAM_BANKS && !end_of_hob(hdr);
diff --git a/arch/x86/lib/fsp/fsp_graphics.c b/arch/x86/lib/fsp/fsp_graphics.c
index 226c7e66b3..98b762209f 100644
--- a/arch/x86/lib/fsp/fsp_graphics.c
+++ b/arch/x86/lib/fsp/fsp_graphics.c
@@ -78,6 +78,9 @@ static int fsp_video_probe(struct udevice *dev)
 	struct vesa_mode_info *vesa = &mode_info.vesa;
 	int ret;
 
+	if (!ll_boot_init())
+		return 0;
+
 	printf("Video: ");
 
 	/* Initialize vesa_mode_info structure */
diff --git a/arch/x86/lib/fsp2/fsp_dram.c b/arch/x86/lib/fsp2/fsp_dram.c
index c8f2c09b6a..3869c53c5f 100644
--- a/arch/x86/lib/fsp2/fsp_dram.c
+++ b/arch/x86/lib/fsp2/fsp_dram.c
@@ -12,11 +12,18 @@
 #include <asm/fsp/fsp_support.h>
 #include <asm/fsp2/fsp_api.h>
 #include <asm/fsp2/fsp_internal.h>
+#include <linux/sizes.h>
 
 int dram_init(void)
 {
 	int ret;
 
+	if (!ll_boot_init()) {
+		/* Use a small and safe amount of 1GB */
+		gd->ram_size = SZ_1G;
+
+		return 0;
+	}
 	if (spl_phase() == PHASE_SPL) {
 #ifdef CONFIG_HAVE_ACPI_RESUME
 		bool s3wake = gd->arch.prev_sleep_state == ACPI_S3;
@@ -68,6 +75,9 @@ int dram_init(void)
 
 ulong board_get_usable_ram_top(ulong total_size)
 {
+	if (!ll_boot_init())
+		return gd->ram_size;
+
 #if CONFIG_IS_ENABLED(HANDOFF)
 	struct spl_handoff *ho = gd->spl_handoff;
 
diff --git a/arch/x86/lib/fsp2/fsp_init.c b/arch/x86/lib/fsp2/fsp_init.c
index da9bd6b45c..c7dc2ea257 100644
--- a/arch/x86/lib/fsp2/fsp_init.c
+++ b/arch/x86/lib/fsp2/fsp_init.c
@@ -23,7 +23,7 @@ int arch_cpu_init_dm(void)
 	int ret;
 
 	/* Make sure pads are set up early in U-Boot */
-	if (spl_phase() != PHASE_BOARD_F)
+	if (!ll_boot_init() || spl_phase() != PHASE_BOARD_F)
 		return 0;
 
 	/* Probe all pinctrl devices to set up the pads */