src/lib/prog_loaders: Add preload_ramstage
This will enable preloading ramstage. By preloading the file into
cbfs_cache we reduce boot time.
BUG=b:179699789
TEST=Boot guybrush to OS and see 12ms reduction in boot time.
Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: Ibe12de806449da25bc0033b02fcb97c3384eddc1
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58982
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
diff --git a/Makefile.inc b/Makefile.inc
index b784f3e..f14bc1e 100644
--- a/Makefile.inc
+++ b/Makefile.inc
@@ -1214,6 +1214,10 @@
$(CONFIG_CBFS_PREFIX)/ramstage-file := $(RAMSTAGE)
$(CONFIG_CBFS_PREFIX)/ramstage-type := stage
$(CONFIG_CBFS_PREFIX)/ramstage-compression := $(CBFS_COMPRESS_FLAG)
+# The AMD LPC SPI DMA controller requires source files to be 64 byte aligned.
+ifeq ($(CONFIG_SOC_AMD_COMMON_BLOCK_LPC_SPI_DMA),y)
+$(CONFIG_CBFS_PREFIX)/ramstage-align := 64
+endif
cbfs-files-$(CONFIG_HAVE_REFCODE_BLOB) += $(CONFIG_CBFS_PREFIX)/refcode
$(CONFIG_CBFS_PREFIX)/refcode-file := $(REFCODE_BLOB)
diff --git a/src/include/program_loading.h b/src/include/program_loading.h
index 5b9a94d..ba42465 100644
--- a/src/include/program_loading.h
+++ b/src/include/program_loading.h
@@ -145,6 +145,13 @@
* RAMSTAGE LOADING *
************************/
+/*
+ * Asynchronously preloads ramstage.
+ *
+ * This should be called early on to allow ramstage to load before
+ * `run_ramstage` is called.
+ */
+void preload_ramstage(void);
/* Run ramstage from romstage. */
void run_ramstage(void);
diff --git a/src/lib/prog_loaders.c b/src/lib/prog_loaders.c
index 8ad646a..878f729e 100644
--- a/src/lib/prog_loaders.c
+++ b/src/lib/prog_loaders.c
@@ -75,7 +75,15 @@
return rmodule_stage_load(&rmod_ram);
}
+void preload_ramstage(void)
+{
+ if (!CONFIG(CBFS_PRELOAD))
+ return;
+ printk(BIOS_DEBUG, "Preloading ramstage\n");
+
+ cbfs_preload(CONFIG_CBFS_PREFIX "/ramstage");
+}
void run_ramstage(void)
{
struct prog ramstage =