Provide a (yet unmerged) patch that allows NixOS to boot correctly on new Pi4 boards using the BCM2711C0 SoC. Revert this when the patch is available in mainline U-Boot. Co-authored-by: Samuel Dionne-Riel <samuel@dionne-riel.com>main
K900
3 years ago
committed by
Samuel Dionne-Riel
parent
32a9c0adc3
commit
b0f99ad527
@ -0,0 +1,92 @@ |
||||
From 65d90cd17ad7cd3f9aeeb805a08be780fc5bae1a Mon Sep 17 00:00:00 2001
|
||||
From: Sjoerd Simons <sjoerd@collabora.com>
|
||||
Date: Sun, 22 Aug 2021 16:36:55 +0200
|
||||
Subject: [PATCH] rpi: Copy properties from firmware dtb to the loaded dtb
|
||||
|
||||
The RPI firmware adjusts several property values in the dtb it passes
|
||||
to u-boot depending on the board/SoC revision. Inherit some of these
|
||||
when u-boot loads a dtb itself. Specificaly copy:
|
||||
|
||||
* /model: The firmware provides a more specific string
|
||||
* /memreserve: The firmware defines a reserved range, better keep it
|
||||
* emmc2bus and pcie0 dma-ranges: The C0T revision of the bcm2711 Soc (as
|
||||
present on rpi 400 and some rpi 4B boards) has different values for
|
||||
these then the B0T revision. So these need to be adjusted to boot on
|
||||
these boards
|
||||
* blconfig: The firmware defines the memory area where the blconfig
|
||||
stored. Copy those over so it can be enabled.
|
||||
* /chosen/kaslr-seed: The firmware generates a kaslr seed, take advantage
|
||||
of that.
|
||||
|
||||
Signed-off-by: Sjoerd Simons <sjoerd@collabora.com>
|
||||
Origin: https://patchwork.ozlabs.org/project/uboot/patch/20210822143656.289891-1-sjoerd@collabora.com/
|
||||
---
|
||||
board/raspberrypi/rpi/rpi.c | 48 +++++++++++++++++++++++++++++++++++++
|
||||
1 file changed, 48 insertions(+)
|
||||
|
||||
diff --git a/board/raspberrypi/rpi/rpi.c b/board/raspberrypi/rpi/rpi.c
|
||||
index 372b26b6f2..64b8684b68 100644
|
||||
--- a/board/raspberrypi/rpi/rpi.c
|
||||
+++ b/board/raspberrypi/rpi/rpi.c
|
||||
@@ -495,10 +495,58 @@ void *board_fdt_blob_setup(void)
|
||||
return (void *)fw_dtb_pointer;
|
||||
}
|
||||
|
||||
+int copy_property(void *dst, void *src, char *path, char *property)
|
||||
+{
|
||||
+ int dst_offset, src_offset;
|
||||
+ const fdt32_t *prop;
|
||||
+ int len;
|
||||
+
|
||||
+ src_offset = fdt_path_offset(src, path);
|
||||
+ dst_offset = fdt_path_offset(dst, path);
|
||||
+
|
||||
+ if (src_offset < 0 || dst_offset < 0)
|
||||
+ return -1;
|
||||
+
|
||||
+ prop = fdt_getprop(src, src_offset, property, &len);
|
||||
+ if (!prop)
|
||||
+ return -1;
|
||||
+
|
||||
+ return fdt_setprop(dst, dst_offset, property, prop, len);
|
||||
+}
|
||||
+
|
||||
+/* Copy tweaks from the firmware dtb to the loaded dtb */
|
||||
+void update_fdt_from_fw(void *fdt, void *fw_fdt)
|
||||
+{
|
||||
+ /* Using dtb from firmware directly; leave it alone */
|
||||
+ if (fdt == fw_fdt)
|
||||
+ return;
|
||||
+
|
||||
+ /* The firmware provides a more precie model; so copy that */
|
||||
+ copy_property(fdt, fw_fdt, "/", "model");
|
||||
+
|
||||
+ /* memory reserve as suggested by the firmware */
|
||||
+ copy_property(fdt, fw_fdt, "/", "memreserve");
|
||||
+
|
||||
+ /* Adjust dma-ranges for the SD card and PCI bus as they can depend on
|
||||
+ * the SoC revision
|
||||
+ */
|
||||
+ copy_property(fdt, fw_fdt, "emmc2bus", "dma-ranges");
|
||||
+ copy_property(fdt, fw_fdt, "pcie0", "dma-ranges");
|
||||
+
|
||||
+ /* Bootloader configuration template exposes as nvmem */
|
||||
+ if (copy_property(fdt, fw_fdt, "blconfig", "reg") == 0)
|
||||
+ copy_property(fdt, fw_fdt, "blconfig", "status");
|
||||
+
|
||||
+ /* kernel address randomisation seed as provided by the firmware */
|
||||
+ copy_property(fdt, fw_fdt, "/chosen", "kaslr-seed");
|
||||
+}
|
||||
+
|
||||
int ft_board_setup(void *blob, struct bd_info *bd)
|
||||
{
|
||||
int node;
|
||||
|
||||
+ update_fdt_from_fw(blob, (void *)fw_dtb_pointer);
|
||||
+
|
||||
node = fdt_node_offset_by_compatible(blob, -1, "simple-framebuffer");
|
||||
if (node < 0)
|
||||
lcd_dt_simplefb_add_node(blob);
|
||||
--
|
||||
2.32.0
|
||||
|
||||
Loading…
Reference in new issue