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Support ramdisk kernel split and snapshot

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Add ramdisk-specific kernel snapshot and build logic so the installer ramdisk can boot with a conservative kernel while the restore target keeps the fully JB-patched kernel. Changes:

- research/patch_comparison_all_variants.md: document the Ramdisk Kernel Split and intent.
- scripts/fw_patch_jb.py: snapshot the base/dev-patched kernel before applying JB extensions (new helper and constants).
- scripts/ramdisk_build.py: build krnl.ramdisk.img4 from the snapshot and krnl.img4 from the restore kernel when a snapshot exists; factor kernel IMG4 creation into build_kernel_img4.
- scripts/ramdisk_send.sh: prefer krnl.ramdisk.img4 when present, falling back to krnl.img4; fail early if no kernel image found.

This improves /dev/disk1s1 remount reliability during CFW/install by keeping the restore kernel JB-patched but booting the installer ramdisk with a more conservative kernel variant.
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Lakr
2026-03-04 22:26:06 +08:00
parent db5a2886fa
commit 8575bef264
4 changed files with 81 additions and 10 deletions
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research/patch_comparison_all_variants.md
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@@ -184,6 +184,17 @@ Regular and Dev share the same 25 base kernel patches. JB adds 34 additional pat
- `jb/org.coolstar.sileo_2.5.1_iphoneos-arm64.deb`
- `basebin/*.dylib` (BaseBin hooks for JB-3)
## Ramdisk Kernel Split (JB mode)
- `scripts/fw_patch_jb.py` now snapshots the base/dev-patched kernel before JB kernel extensions:
- `iPhone*_Restore/kernelcache.research.vphone600.ramdisk`
- `scripts/ramdisk_build.py` uses that snapshot to build:
- `Ramdisk/krnl.ramdisk.img4` (base/dev kernel for SSH ramdisk boot + CFW install)
- `Ramdisk/krnl.img4` (post-JB kernel, unchanged restore target)
- `scripts/ramdisk_send.sh` now prefers `krnl.ramdisk.img4` when present, otherwise falls back to `krnl.img4`.
- Intent: keep restore kernel fully JB-patched while booting the installer ramdisk with a
more conservative kernel variant to improve `/dev/disk1s1` remount reliability.
## Dynamic Implementation Log (JB Patchers)
### TXM (`txm_dev.py`)