MLK-16049 imx8qm/qxp: Add support for reserving DDR memory for M4

We assign the DDR memory from 0x88000000 to 0x8FFFFFFF 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: Ye Li <ye.li@nxp.com>

diff --git a/arch/arm/mach-imx/imx8/cpu.c b/arch/arm/mach-imx/imx8/cpu.c
index 18bd33e..7361dbc 100644 (file)
--- a/arch/arm/mach-imx/imx8/cpu.c
+++ b/arch/arm/mach-imx/imx8/cpu.c
@@ -20,6 +20,7 @@
 #include <asm/armv8/cpu.h>
 #include <asm/armv8/mmu.h>
 #include <asm/mach-imx/boot_mode.h>
+#include <linux/libfdt.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -455,6 +456,22 @@ int mmc_get_env_dev(void)
 }
 #endif
 
+#ifdef CONFIG_OF_SYSTEM_SETUP
+int ft_system_setup(void *blob, bd_t *bd)
+{
+#ifdef BOOTAUX_RESERVED_MEM_BASE
+       int off;
+       off = fdt_add_mem_rsv(blob, BOOTAUX_RESERVED_MEM_BASE,
+                                     BOOTAUX_RESERVED_MEM_SIZE);
+               if (off < 0)
+                       printf("Failed  to reserve memory for bootaux: %s\n",
+                              fdt_strerror(off));
+#endif
+
+       return 0;
+}
+#endif
+
 #define MEMSTART_ALIGNMENT  SZ_2M /* Align the memory start with 2MB */
 
 static int get_owned_memreg(sc_rm_mr_t mr, sc_faddr_t *addr_start,