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- From 5f856ccc34df25060d36a5a81b7b45b574d86e35 Mon Sep 17 00:00:00 2001
- From: David Bauer <[email protected]>
- Date: Sun, 3 Dec 2023 20:09:24 +0100
- Subject: [PATCH] arch: powerpc: simpleboot: prevent overwrite of CPU1
- spin-table
- Don't overwrite the spin-table of additional CPU cores with loader-heap.
- U-Boot places the spin-table for CPU1 on P1020 SoCs in the top 1MB of
- system-memory. Instead of parsing reserved-memory (which would be
- considerable more work), reduce the available system-memory for the
- loader by 1MB.
- This prevents the loader from overwriting the spin-table of
- additional CPU cores on these platforms.
- Linux itself needs to be made aware by this using reserved-memory
- definitions.
- This patch is required for using CPU1 on the Extreme Networks
- WS-AP3825i.
- Signed-off-by: David Bauer <[email protected]>
- ---
- arch/powerpc/boot/simpleboot.c | 5 +++++
- 1 file changed, 5 insertions(+)
- --- a/arch/powerpc/boot/simpleboot.c
- +++ b/arch/powerpc/boot/simpleboot.c
- @@ -65,6 +65,11 @@ void platform_init(unsigned long r3, uns
- if (sizeof(void *) == 4 && memsize64 >= 0x100000000ULL)
- memsize64 = 0xffffffff;
-
- + /* Reserve upper 1 MB of memory for CPU1 spin-table */
- + if (memsize64 > 0x100000) {
- + memsize64 = memsize64 - 0x100000;
- + }
- +
- /* finally, setup the timebase */
- node = fdt_node_offset_by_prop_value(_dtb_start, -1, "device_type",
- "cpu", sizeof("cpu"));
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