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authorJanne Grunau <j@jannau.net>2022-02-19 14:05:19 +0100
committerTom Rini <trini@konsulko.com>2022-02-28 10:33:45 -0500
commit6fb4f7387e17664e2e6cea1217fe9e95cc0a1170 (patch)
tree4816e6bc7b7599ef716bbb7a09556244e7535974 /arch
parent551f426011e31fad37fe66108ffdf05eb48e3176 (diff)
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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>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/mach-apple/board.c33
1 files changed, 33 insertions, 0 deletions
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 @@ 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;
+}