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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>
Peng Fan před 4 roky
rodič
revize
f44afd546f
2 změnil soubory, kde provedl 18 přidání a 0 odebrání
  1. 8 0
      arch/arm/mach-imx/imx8/Kconfig
  2. 10 0
      arch/arm/mach-imx/imx8/fdt.c

+ 8 - 0
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

+ 10 - 0
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);