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arm64: dts: k3-am623-pfc-750-8xxx: add no-map and gap reservations for AM623 PFC

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Add missing no-map property to ramoops region to prevent Linux
from managing it as regular memory.

Reserve gap regions adjacent to ioremap_wc-mapped M4 memory to
avoid ARM64 cache aliasing issues caused by Linux allocating
pages next to these regions.

Also reserve a gap between r5f-dma-memory and TF-A region to
prevent potential memory conflicts.

Signed-off-by: Heinrich Toews <ht@twx-software.de>
This commit is contained in:
Heinrich Toews
2026-03-18 17:29:27 +01:00
parent 84f6b6b2b4
commit fb6487598d
1 changed files with 15 additions and 0 deletions
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arch/arm64/boot/dts/ti/k3-am623-pfc-750-8xxx-common.dtsi
+15
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@@ -71,6 +71,7 @@
ramoops@9ca00000 {
compatible = "ramoops";
reg = <0x00 0x9ca00000 0x00 0x00100000>;
no-map;
record-size = <0x8000>;
console-size = <0x8000>;
ftrace-size = <0x00>;
@@ -89,12 +90,26 @@
no-map;
};
/* Gap between m4f-memory and r5f-dma-memory: must be reserved
* to prevent Linux from allocating pages that are adjacent to
* ioremap_wc-mapped M4 regions (ARM64 cache aliasing). */
m4f_gap_memory: m4f-gap@9da00000 {
reg = <0x00 0x9da00000 0x00 0x100000>;
no-map;
};
wkup_r5fss0_core0_dma_memory_region: r5f-dma-memory@9db00000 {
compatible = "shared-dma-pool";
reg = <0x00 0x9db00000 0x00 0xc00000>;
no-map;
};
/* Gap between r5f-dma-memory and tfa */
r5f_gap_memory: r5f-gap@9e700000 {
reg = <0x00 0x9e700000 0x00 0x80000>;
no-map;
};
mcu_m4fss_dma_memory_region: m4f-dma-memory@9cb00000 {
compatible = "shared-dma-pool";
reg = <0x00 0x9cb00000 0x00 0x100000>;