ssmithxandClaude Opus 5.5
36b1464a18
Four board fixes, in mt7986a-glinet-gl-mt6000-guix.dtsi (appended to OpenWrt's DTS, replacing the FIT script's fdtput edits) and the system: - secmon: GL's BL31 uses 256 KiB, not mainline's 192 KiB. - WED off and mainline's wo-ilm/wo-dlm/wo-boot no-map regions removed: with them the kernel resets within seconds under GL's firmware. - eMMC partitions in mainline's binding (gpt-partitions under card@0): OpenWrt's card@0/block/partitions isn't read by 6.13+, so `factory' had no NVMEM cells -- no WiFi calibration, and mtk_eth_soc deferred forever for its MAC address. - clk_ignore_unused: mtk_eth_soc, a module, loads after unused clocks are turned off, and its MDIO bus timed out. ramoops is built in, with a console record, so a failed boot's kernel log survives a warm reset. docs/PITFALLS.md #49-#52: these, GL U-Boot's TFTP recovery, and the image system's root UUID. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
115 lines
3.7 KiB
Bash
Executable File
115 lines
3.7 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Build the FIT image GL.iNet's U-Boot boots from the GL-MT6000's `kernel'
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# partition (p6, 32 MiB), for one Guix system generation:
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# kernel-1 the system's Image, LZMA-compressed, loaded at 0x48000000
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# fdt-1 mt7986a-glinet-gl-mt6000.dtb with the Guix command line in
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# /chosen/bootargs-append (GL's U-Boot passes empty bootargs;
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# linux-mt6000 carries OpenWrt's bootargs-append patch)
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# initrd-1 the system's initrd
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# Same layout as OpenWrt's MT6000 FIT (kernel-1, fdt-1, config-1), plus the
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# ramdisk OpenWrt's initramfs image also carries.
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#
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# Usage: scripts/mt6000-fit.sh /gnu/store/...-system OUTPUT.itb
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set -euo pipefail
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sys=${1:?usage: $0 SYSTEM OUTPUT.itb}
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out=$(realpath -m "${2:?usage: $0 SYSTEM OUTPUT.itb}")
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limit=$((32 * 1024 * 1024))
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export PATH=$HOME/.local/bin:$PATH
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# The package's main output: name-version, no -static/-doc suffix.
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tool() { guix build "$1" 2>/dev/null | grep -E -- "-$1-[0-9][^-]*\$"; }
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mkimage=$(tool u-boot-tools)/bin/mkimage
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dtc=$(tool dtc)/bin
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fdtput=$dtc/fdtput
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xz=$(tool xz)/bin/xz
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params=$(cat "$sys/parameters")
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# root=LABEL or root=UUID, as Guix's bootloader configurations do. (`guix
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# system image' gives the image's system its root partition's UUID.)
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root=$(sed -n 's/.*(root-device (file-system-label "\([^"]*\)")).*/\1/p' <<<"$params")
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if [ -z "$root" ]; then
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bytes=$(sed -n 's/.*(root-device (uuid [a-z0-9]* #vu8(\([0-9 ]*\)))).*/\1/p' <<<"$params")
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[ -n "$bytes" ] || { echo "$0: no label or UUID root in $sys/parameters" >&2; exit 1; }
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hex=$(printf '%02x' $bytes)
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root=${hex:0:8}-${hex:8:4}-${hex:12:4}-${hex:16:4}-${hex:20:12}
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fi
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kargs=$(sed -n 's/.*(kernel-arguments (\([^)]*\))).*/\1/p' <<<"$params" | tr -d '"')
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cmdline="root=$root gnu.system=$sys gnu.load=$sys/boot $kargs"
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kernel=$(readlink -f "$sys/kernel")
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initrd=$(readlink -f "$sys/initrd")
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dtb=$kernel/lib/dtbs/mediatek/mt7986a-glinet-gl-mt6000.dtb
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[ -f "$dtb" ] || { echo "$0: $dtb missing" >&2; exit 1; }
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work=$(mktemp -d)
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trap 'rm -rf "$work"' EXIT
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"$xz" --format=lzma -9 -c "$kernel/Image" > "$work/Image.lzma"
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cp "$dtb" "$work/board.dtb"
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chmod u+w "$work/board.dtb"
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# Leading space: appended to whatever U-Boot passes (nothing, here).
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"$fdtput" -t s "$work/board.dtb" /chosen bootargs-append " $cmdline"
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# (Board fixes for GL's firmware and this kernel: in the DTB, from
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# mt7986a-glinet-gl-mt6000-guix.dtsi.)
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cp "$initrd" "$work/initrd"
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cat > "$work/image.its" <<EOF
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/dts-v1/;
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/ {
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description = "Guix System for the GL-MT6000";
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#address-cells = <1>;
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images {
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kernel-1 {
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description = "Linux ($(basename "$kernel"))";
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data = /incbin/("Image.lzma");
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type = "kernel";
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arch = "arm64";
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os = "linux";
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compression = "lzma";
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load = <0x48000000>;
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entry = <0x48000000>;
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hash-1 { algo = "crc32"; };
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hash-2 { algo = "sha1"; };
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};
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fdt-1 {
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description = "mt7986a-glinet-gl-mt6000";
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data = /incbin/("board.dtb");
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type = "flat_dt";
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arch = "arm64";
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compression = "none";
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hash-1 { algo = "crc32"; };
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};
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initrd-1 {
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description = "Guix initrd";
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data = /incbin/("initrd");
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type = "ramdisk";
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arch = "arm64";
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os = "linux";
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compression = "none";
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hash-1 { algo = "crc32"; };
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};
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};
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configurations {
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default = "config-1";
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config-1 {
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description = "$(basename "$sys")";
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kernel = "kernel-1";
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fdt = "fdt-1";
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ramdisk = "initrd-1";
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};
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};
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};
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EOF
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# mkimage runs dtc; /incbin paths are relative to the work directory.
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(cd "$work" && PATH=$dtc:$PATH "$mkimage" -f image.its "$out" >/dev/null)
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size=$(stat -c %s "$out")
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if [ "$size" -gt "$limit" ]; then
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echo "$0: $out is $size bytes, over the 32 MiB kernel partition" >&2
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exit 1
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fi
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echo "$out: $size bytes; command line: $cmdline"
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