[S] Change in coreboot[master]: soc/mediatek/mt8173: Allow BL31 payload not targeting RAM

[Yidi Lin (Code Review)]

Yidi Lin has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/70344 )

Change subject: soc/mediatek/mt8173: Allow BL31 payload not targeting RAM
......................................................................

soc/mediatek/mt8173: Allow BL31 payload not targeting RAM

selfboot.c blocks the payload that does not target RAM. But MT8173 loads
and runs BL31 payload in SRAM. Make the exception by implementing
`payload_arch_usable_ram_quirk()`.

TEST=load and initialize BL31 successfully

Change-Id: I8951b1c4673cdae7d1ad0c11d7d6c12376acd328
Signed-off-by: Yidi Lin 
---
M src/soc/mediatek/mt8173/soc.c
1 file changed, 27 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/44/70344/1

diff --git a/src/soc/mediatek/mt8173/soc.c b/src/soc/mediatek/mt8173/soc.c
index c1bb621..23c23a4 100644
--- a/src/soc/mediatek/mt8173/soc.c
+++ b/src/soc/mediatek/mt8173/soc.c
@@ -2,9 +2,20 @@

#include <bootmem.h>
 #include <device/device.h>
+#include <program_loading.h>
 #include <symbols.h>
 #include <soc/emi.h>

+int payload_arch_usable_ram_quirk(uint64_t start, uint64_t size)
+{
+	if (start < 0x130000 && (start + size) <= 0x130000) {
+		printk(BIOS_DEBUG, "MT8173 uses SRAM for loading BL31.\n");
+		return 1;
+	}
+
+	return 0;
+}
+
 void bootmem_platform_add_ranges(void)
 {
    bootmem_add_range(0x101000, 124 * KiB, BM_MEM_BL31);