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