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imx: imx8qm/qxp: reserving DDR memory for M4

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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>
This commit is contained in:
Peng Fan 2020-05-05 20:28:37 +08:00 committed by Stefano Babic
parent bf9382addf
commit f44afd546f
2 changed files with 18 additions and 0 deletions
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8
arch/arm/mach-imx/imx8/Kconfig
View File

@ -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
arch/arm/mach-imx/imx8/fdt.c
View File

@ -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);