Initial commit

2025-06-24 13:14:22 +02:00
commit 4002f145fc
9002 changed files with 1731834 additions and 0 deletions
--- a/target/linux/bcm27xx/patches-5.10/950-0508-overlays-Add-pcie-32bit-dma-overlay.patch
+++ b/target/linux/bcm27xx/patches-5.10/950-0508-overlays-Add-pcie-32bit-dma-overlay.patch
@@ -0,0 +1,86 @@
+From ce2860020c57a59c543139ad7b260624cd930dff Mon Sep 17 00:00:00 2001
+From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
+Date: Mon, 15 Mar 2021 17:25:02 +0100
+Subject: [PATCH] overlays: Add pcie-32bit-dma overlay
+
+In order to accommodate full PCI DMA access to memory on newer BCM2711
+revisions, we're forced to map PCIe's view of physical memory with an
+offset. This offset makes DMA addressing dependent on having 64bit
+support on the PCI device's side. Which isn't always the case.
+
+In order to mitigate this, introduce the pcie-32bit-dma overlay which
+will forbid firmware from updating the default inbound memory window.
+The default setting, albeit limited to accessing the lower 3GB of
+memory, will allow for 32bit DMA addresses at the expense of having to
+bounce buffers.
+
+Link: https://github.com/raspberrypi/linux/issues/4197
+Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
+---
+ arch/arm/boot/dts/overlays/Makefile            |  1 +
+ arch/arm/boot/dts/overlays/README              |  7 +++++++
+ arch/arm/boot/dts/overlays/overlay_map.dts     |  4 ++++
+ .../dts/overlays/pcie-32bit-dma-overlay.dts    | 18 ++++++++++++++++++
+ 4 files changed, 30 insertions(+)
+ create mode 100644 arch/arm/boot/dts/overlays/pcie-32bit-dma-overlay.dts
+
+--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
+@@ -128,6 +128,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
+ 	ov9281.dtbo \
+ 	papirus.dtbo \
+ 	pca953x.dtbo \
+	pcie-32bit-dma.dtbo \
+ 	pibell.dtbo \
+ 	pifacedigital.dtbo \
+ 	pifi-40.dtbo \
+--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
+@@ -2135,6 +2135,13 @@ Params: addr                    I2C addr
+         xra1202                 Select the Exar XRA1202 (8 bit)
+ 
+ 
+Name:   pcie-32bit-dma
+Info:   Force PCIe config to support 32bit DMA addresses at the expense of
+        having to bounce buffers.
+Load:   dtoverlay=pcie-32bit-dma
+Params: <None>
+
+
+ [ The pcf2127-rtc overlay has been deleted. See i2c-rtc. ]
+ 
+ 
+--- a/arch/arm/boot/dts/overlays/overlay_map.dts
+++ b/arch/arm/boot/dts/overlays/overlay_map.dts
+@@ -37,6 +37,10 @@
+ 		deprecated = "use gpio-ir";
+ 	};
+ 
+	pcie-32bit-dma {
+		bcm2711;
+	};
+
+ 	pi3-act-led {
+ 		renamed = "act-led";
+ 	};
+--- /dev/null
+++ b/arch/arm/boot/dts/overlays/pcie-32bit-dma-overlay.dts
+@@ -0,0 +1,18 @@
+/*
+ * pcie-32bit-dma-overlay.dts
+ */
+
+/dts-v1/;
+/plugin/;
+
+/ {
+	compatible = "brcm,bcm2711";
+
+	fragment@0 {
+		target-path = "/aliases";
+		__overlay__ {
+			pcie0 = "";
+		};
+	};
+
+};