[PATCH v2 1/4] riscv: dts: Update memory configuration

Padmarao Begari
2022-10-21T06:59:55Z

In the v2022.10 Icicle reference design, the seg registers are going to be
changed, resulting in a required change to the memory map.
A small 4MB reservation is made at the end of 32-bit DDR to provide some
memory for the HSS to use, so that it can cache its payload between
reboots of a specific context.

Co-developed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Padmarao Begari <padmarao.begari@microchip.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
---
arch/riscv/dts/microchip-mpfs-icicle-kit.dts | 70 ++++----------------
1 file changed, 14 insertions(+), 56 deletions(-)

diff --git a/arch/riscv/dts/microchip-mpfs-icicle-kit.dts b/arch/riscv/dts/microchip-mpfs-icicle-kit.dts
index 287ef3d23b..876c475069 100644
--- a/arch/riscv/dts/microchip-mpfs-icicle-kit.dts
+++ b/arch/riscv/dts/microchip-mpfs-icicle-kit.dts
@@ -1,6 +1,6 @@
// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
/*
- * Copyright (C) 2021 Microchip Technology Inc.
+ * Copyright (C) 2021-2022 Microchip Technology Inc.
* Padmarao Begari <padmarao.begari@microchip.com>
*/

@@ -28,70 +28,28 @@
timebase-frequency = <RTCCLK_FREQ>;
};

- reserved-memory {
- ranges;
- #size-cells = <2>;
- #address-cells = <2>;
-
- fabricbuf0: fabricbuf@0 {
- compatible = "shared-dma-pool";
- reg = <0x0 0xae000000 0x0 0x2000000>;
- label = "fabricbuf0-ddr-c";
- };
-
- fabricbuf1: fabricbuf@1 {
- compatible = "shared-dma-pool";
- reg = <0x0 0xc0000000 0x0 0x8000000>;
- label = "fabricbuf1-ddr-nc";
- };
-
- fabricbuf2: fabricbuf@2 {
- compatible = "shared-dma-pool";
- reg = <0x0 0xd8000000 0x0 0x8000000>;
- label = "fabricbuf2-ddr-nc-wcb";
- };
- };
-
- udmabuf0 {
- compatible = "ikwzm,u-dma-buf";
- device-name = "udmabuf-ddr-c0";
- minor-number = <0>;
- size = <0x0 0x2000000>;
- memory-region = <&fabricbuf0>;
- sync-mode = <3>;
- };
-
- udmabuf1 {
- compatible = "ikwzm,u-dma-buf";
- device-name = "udmabuf-ddr-nc0";
- minor-number = <1>;
- size = <0x0 0x8000000>;
- memory-region = <&fabricbuf1>;
- sync-mode = <3>;
- };
-
- udmabuf2 {
- compatible = "ikwzm,u-dma-buf";
- device-name = "udmabuf-ddr-nc-wcb0";
- minor-number = <2>;
- size = <0x0 0x8000000>;
- memory-region = <&fabricbuf2>;
- sync-mode = <3>;
- };
-
ddrc_cache_lo: memory@80000000 {
device_type = "memory";
- reg = <0x0 0x80000000 0x0 0x2e000000>;
- clocks = <&clkcfg CLK_DDRC>;
+ reg = <0x0 0x80000000 0x0 0x40000000>;
status = "okay";
};

ddrc_cache_hi: memory@1000000000 {
device_type = "memory";
- reg = <0x10 0x0 0x0 0x40000000>;
- clocks = <&clkcfg CLK_DDRC>;
+ reg = <0x10 0x40000000 0x0 0x40000000>;
status = "okay";
};
+
+ reserved-memory {
+ #address-cells = <2>;
+ #size-cells = <2>;
+ ranges;
+
+ hss_payload: region@BFC00000 {
+ reg = <0x0 0xBFC00000 0x0 0x400000>;
+ no-map;
+ };
+ };
};

&uart1 {
--
2.25.1