diff options
| author | Janne Grunau | 2022-02-19 14:05:19 +0100 |
|---|---|---|
| committer | Tom Rini | 2022-02-28 10:33:45 -0500 |
| commit | 6fb4f7387e17664e2e6cea1217fe9e95cc0a1170 (patch) | |
| tree | 4816e6bc7b7599ef716bbb7a09556244e7535974 /arch | |
| parent | 551f426011e31fad37fe66108ffdf05eb48e3176 (diff) | |
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.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/arch/arm/mach-apple/board.c b/arch/arm/mach-apple/board.c index f9f8a2f2780..54005f3adf0 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; +} |