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
--- a/arch/arm/mach-apple/board.c
+++ b/arch/arm/mach-apple/board.c
@@ -265,3 +265,36 @@
{
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;
+}