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