feat(dts): emit 64-bit initrd device-tree cells for large initramfs#25
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The device tree packed linux,initrd-start/end into single 32-bit cells, truncating the physical address for a total initramfs above 4 GiB. Compute 64-bit hi/lo halves in build-firmware-linux.sh and switch every device-tree template to <hi lo> cell pairs; below 4 GiB the high cell resolves to 0, so existing images are byte-identical. Add a mem128g-novec profile for guests whose initramfs boot-unpack peak (blob + rootfs) exceeds 64 GiB. Assisted-by: Claude Opus 4.8
poemonsense
approved these changes
Jul 10, 2026
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The device tree packed
linux,initrd-start/linux,initrd-endinto single32-bit cells, which truncates the physical address once the total initramfs
exceeds 4 GiB.
dtconly warns on out-of-range cells (exit 0), so thetruncation is silent — a >4 GiB initramfs boots with a short/corrupt rootfs.
Changes
build-firmware-linux.shcomputes 64-bit hi/lo halves of the initramfsbegin/end addresses and substitutes
INITRAMFS_{BEGIN,END}_{HI,LO}into thetemplates. The
_HI/_LOtokens are substituted before the bareINITRAMFS_BEGIN/INITRAMFS_ENDto avoid a prefix collision.linux,initrd-start/endto<hi lo>cell pairs. Below 4 GiB the high cell resolves to
0x0, so existing imagesare byte-identical; above 4 GiB the address is preserved instead of truncated.
xiangshan-fpga-noAIA-mem128g-novecprofile (128 GiB memory node) forguests whose initramfs boot-unpack peak exceeds 64 GiB.