arm: apple: Switch to fully dynamic mem layout

Support for Apple M1 Pro and Max will allow using a single binary for
all M1 SoCs. The M1 Pro/Max have a different memory layout. The RAM
start address is 0x100_0000_0000 instead of 0x8_0000_0000.
Replace the hardcoded memory layout with dynamic initialized
environment variables in board_late_init().

Tested on Mac Mini (2020) and Macbook Pro 14-inch (2021).

Signed-off-by: Janne Grunau <j@jannau.net>
Reviewed-by: Mark Kettenis <kettenis@openbsd.org>

diff --git a/arch/arm/mach-apple/board.c b/arch/arm/mach-apple/board.c
index f9f8a2f..54005f3 100644 (file)
--- a/arch/arm/mach-apple/board.c
+++ b/arch/arm/mach-apple/board.c
@@ -265,3 +265,36 @@ u64 get_page_table_size(void)
 {
        return SZ_256K;
 }
+
+int board_late_init(void)
+{
+       unsigned long base;
+       unsigned long top;
+       u32 status = 0;
+
+       /* Reserve 4M each for scriptaddr and pxefile_addr_r at the top of RAM
+        * at least 1M below the stack.
+        */
+       top = gd->start_addr_sp - CONFIG_STACK_SIZE - SZ_8M - SZ_1M;
+       top = ALIGN_DOWN(top, SZ_8M);
+
+       status |= env_set_hex("scriptaddr", top + SZ_4M);
+       status |= env_set_hex("pxefile_addr_r", top);
+
+       /* somewhat based on the Linux Kernel boot requirements:
+        * align by 2M and maximal FDT size 2M
+        */
+       base = ALIGN(gd->ram_base, SZ_2M);
+
+       status |= env_set_hex("fdt_addr_r", base);
+       status |= env_set_hex("kernel_addr_r", base + SZ_2M);
+       status |= env_set_hex("ramdisk_addr_r", base + SZ_128M);
+       status |= env_set_hex("loadaddr", base + SZ_2G);
+       status |= env_set_hex("kernel_comp_addr_r", base + SZ_2G - SZ_128M);
+       status |= env_set_hex("kernel_comp_size", SZ_128M);
+
+       if (status)
+               log_warning("late_init: Failed to set run time variables\n");
+
+       return 0;
+}

diff --git a/configs/apple_m1_defconfig b/configs/apple_m1_defconfig
index 9254e24..360ec3f 100644 (file)
--- a/configs/apple_m1_defconfig
+++ b/configs/apple_m1_defconfig
@@ -3,10 +3,11 @@ CONFIG_ARCH_APPLE=y
 CONFIG_DEFAULT_DEVICE_TREE="t8103-j274"
 CONFIG_DEBUG_UART_BASE=0x235200000
 CONFIG_DEBUG_UART_CLOCK=24000000
-CONFIG_SYS_LOAD_ADDR=0x880000000
+CONFIG_SYS_LOAD_ADDR=0x0
 CONFIG_USE_PREBOOT=y
 # CONFIG_DISPLAY_CPUINFO is not set
 CONFIG_DISPLAY_BOARDINFO_LATE=y
+CONFIG_BOARD_LATE_INIT=y
 # CONFIG_NET is not set
 CONFIG_APPLE_SPI_KEYB=y
 # CONFIG_MMC is not set

diff --git a/include/configs/apple.h b/include/configs/apple.h
index f12e9bd..b06660a 100644 (file)
--- a/include/configs/apple.h
+++ b/include/configs/apple.h
@@ -9,10 +9,6 @@
        "stdout=serial,vidconsole\0" \
        "stderr=serial,vidconsole\0"
 
-#define ENV_MEM_LAYOUT_SETTINGS \
-       "fdt_addr_r=0x960100000\0" \
-       "kernel_addr_r=0x960200000\0"
-
 #if CONFIG_IS_ENABLED(CMD_NVME)
        #define BOOT_TARGET_NVME(func) func(NVME, nvme, 0)
 #else
@@ -33,7 +29,6 @@
 
 #define CONFIG_EXTRA_ENV_SETTINGS \
        ENV_DEVICE_SETTINGS \
-       ENV_MEM_LAYOUT_SETTINGS \
        BOOTENV
 
 #endif