From: Peng Fan <peng.fan@nxp.com>
Date: Tue, 5 May 2020 12:28:37 +0000 (+0800)
Subject: imx: imx8qm/qxp: reserving DDR memory for M4
X-Git-Url: http://git.dujemihanovic.xyz/img/sics.gif?a=commitdiff_plain;h=f44afd546f6236479581469e1fb969c9ce9f9eac;p=u-boot.git

imx: imx8qm/qxp: reserving DDR memory for M4

The DDR memory from 0x88000000 to 0x8FFFFFFF is assigned to M4 on
QM and QXP. The M4 can allocate this memory by two ways,
in SCD or u-boot.

In this patch, u-boot addes the memory reserve node to DTB to pass
the info to kernel, no matter the M4 memory is reserved in SCD
or u-boot. So kernel won't access M4 reserved memory.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
---

diff --git a/arch/arm/mach-imx/imx8/Kconfig b/arch/arm/mach-imx/imx8/Kconfig
index 1f8add015f..69149d3cd5 100644
--- a/arch/arm/mach-imx/imx8/Kconfig
+++ b/arch/arm/mach-imx/imx8/Kconfig
@@ -41,6 +41,14 @@ config IMX_CONTAINER_CFG
 	  This is to specific the cfg file for generating container
 	  image which will be loaded by SPL.
 
+config BOOTAUX_RESERVED_MEM_BASE
+	hex "i.MX auxiliary core dram memory base"
+	default 0
+
+config BOOTAUX_RESERVED_MEM_SIZE
+	hex "i.MX auxiliary core dram memory size"
+	default 0
+
 choice
 	prompt "i.MX8 board select"
 	optional
diff --git a/arch/arm/mach-imx/imx8/fdt.c b/arch/arm/mach-imx/imx8/fdt.c
index 65c8ac1a7e..5993645378 100644
--- a/arch/arm/mach-imx/imx8/fdt.c
+++ b/arch/arm/mach-imx/imx8/fdt.c
@@ -8,6 +8,7 @@
 #include <asm/arch/sys_proto.h>
 #include <dm/ofnode.h>
 #include <fdt_support.h>
+#include <linux/libfdt.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -279,6 +280,15 @@ static int ft_add_optee_node(void *fdt, bd_t *bd)
 int ft_system_setup(void *blob, bd_t *bd)
 {
 	int ret;
+	int off;
+
+	if (CONFIG_BOOTAUX_RESERVED_MEM_BASE) {
+		off = fdt_add_mem_rsv(blob, CONFIG_BOOTAUX_RESERVED_MEM_BASE,
+				      CONFIG_BOOTAUX_RESERVED_MEM_SIZE);
+		if (off < 0)
+			printf("Failed	to reserve memory for bootaux: %s\n",
+			       fdt_strerror(off));
+	}
 
 	update_fdt_with_owned_resources(blob);