From: Vitor Soares <vitor.soares@toradex.com>
Date: Thu, 28 Mar 2024 10:05:48 +0000 (+0000)
Subject: arm: mach-k3: common: EFI loader map memory below ram top
X-Git-Url: http://git.dujemihanovic.xyz/html/index.html?a=commitdiff_plain;h=3206b77c844c7f2d85e9154982f6ef9d72adaab6;p=u-boot.git

arm: mach-k3: common: EFI loader map memory below ram top

During the boot, the EFI loader maps the memory from ram_top to ram_end
as EFI_BOOT_SERVICES_DATA. When LMB does boot_fdt_add_mem_rsv_regions()
to OPTEE, TFA, R5, and M4F DMA/memory "no-map" for the kernel it produces
the following error message:

ERROR: reserving fdt memory region failed (addr=9cb00000 size=100000 flags=4)
ERROR: reserving fdt memory region failed (addr=9cc00000 size=e00000 flags=4)
ERROR: reserving fdt memory region failed (addr=9da00000 size=100000 flags=4)
ERROR: reserving fdt memory region failed (addr=9db00000 size=c00000 flags=4)
ERROR: reserving fdt memory region failed (addr=9e780000 size=80000 flags=4)
ERROR: reserving fdt memory region failed (addr=9e800000 size=1800000 flags=4)

To avoid this, don't flag with EFI_BOOT_SERVICES_DATA the memory from
ram_top to ram_end by the EFI loader.

Signed-off-by: Vitor Soares <vitor.soares@toradex.com>
---

diff --git a/arch/arm/mach-k3/common.c b/arch/arm/mach-k3/common.c
index b0fb87b97a..458e1a3aee 100644
--- a/arch/arm/mach-k3/common.c
+++ b/arch/arm/mach-k3/common.c
@@ -24,6 +24,7 @@
 #include <asm/io.h>
 #include <fs_loader.h>
 #include <fs.h>
+#include <efi_loader.h>
 #include <env.h>
 #include <elf.h>
 #include <soc.h>
@@ -296,3 +297,14 @@ void setup_qos(void)
 		writel(qos_data[i].val, (uintptr_t)qos_data[i].reg);
 }
 #endif
+
+void efi_add_known_memory(void)
+{
+	if (IS_ENABLED(CONFIG_EFI_LOADER))
+		/*
+		 * Memory over ram_top can be used by various firmware
+		 * Declare to EFI only memory area below ram_top
+		 */
+		efi_add_memory_map(gd->ram_base, gd->ram_top - gd->ram_base,
+				   EFI_CONVENTIONAL_MEMORY);
+}