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On MT7621 it was observed, that enabling highmem support causes a significant
performance drop, as documented in: https://github.com/openwrt/openwrt/issues/13151
By adjusting the highmem start offset, we avoid leaving any RAM unaddressable,
even on devices with 512 MB
Fixes: https://github.com/openwrt/openwrt/issues/13151
Signed-off-by: Felix Fietkau <nbd@nbd.name>
(cherry picked from commit cd2b74e01e)
20 lines
583 B
Diff
20 lines
583 B
Diff
From: Felix Fietkau <nbd@nbd.name>
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Date: Mon Jul 24 13:29:13 CEST 2023
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Subject: [PATCH] mips: ralink: increase highmem start
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Increase highmem start address in order to support devices with 512 MB memory
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and MT7621 SoC
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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--- a/arch/mips/include/asm/mach-ralink/spaces.h
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+++ b/arch/mips/include/asm/mach-ralink/spaces.h
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@@ -5,6 +5,7 @@
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#define PCI_IOBASE _AC(0xa0000000, UL)
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#define PCI_IOSIZE SZ_16M
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#define IO_SPACE_LIMIT (PCI_IOSIZE - 1)
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+#define HIGHMEM_START _AC(0x24000000, UL)
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#include <asm/mach-generic/spaces.h>
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#endif
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