[PATCH 01/10] imx: imx8qm/qxp: reserving DDR memory for M4

Peng Fan
2020-05-05T12:28:37Z

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>
---
arch/arm/mach-imx/imx8/Kconfig | 8 ++++++++
arch/arm/mach-imx/imx8/fdt.c | 10 ++++++++++
2 files changed, 18 insertions(+)

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);

--
2.16.4