Update docs for FydeOS install on eMMC, stale Flex UEFI entry removed
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
ergosteur
co-authored by
Claude Opus 5.5
Claude Opus 5.5
parent
172f5c9f75
commit
c7231628b8
+55
-18
@@ -1,11 +1,14 @@
|
||||
# ChromeOS Flex on hp-chell's internal eMMC
|
||||
# ChromeOS (Flex / FydeOS) on hp-chell's internal eMMC
|
||||
|
||||
**Currently installed: FydeOS** (`iris` build, 2026-09-27). It replaced
|
||||
ChromeOS Flex; `install-flex-emmc.sh` handles both images.
|
||||
|
||||
hp-chell (HP Chromebook 13 G1, MrChromebox UEFI firmware) dual-boots:
|
||||
|
||||
| OS | Disk | Notes |
|
||||
|---|---|---|
|
||||
| KDE neon | `sda`, external USB/SD card (117GB) | primary OS, owns GRUB |
|
||||
| ChromeOS Flex | `mmcblk0`, internal eMMC (29GB) | installed from neon, see below |
|
||||
| FydeOS (was ChromeOS Flex) | `mmcblk0`, internal eMMC (29GB) | installed from neon, see below |
|
||||
|
||||
Because neon lives entirely on external media, the eMMC can be wiped and
|
||||
reinstalled from the running neon system with no risk to neon.
|
||||
@@ -29,7 +32,11 @@ sudo ./install-flex-emmc.sh ~/Downloads/chromeos_<ver>_reven_recovery_stable-cha
|
||||
- Updates the GRUB chainload entry (below) with the new EFI partition's
|
||||
UUID and runs `update-grub`.
|
||||
|
||||
Last installed: 2026-09-27, Flex `16640.57.0` (stable, `reven`).
|
||||
Install history on the eMMC:
|
||||
- 2026-09-27: ChromeOS Flex `16640.57.0` (stable, `reven`). It
|
||||
auto-updated to `16640.61.0` on first boot.
|
||||
- 2026-09-27: **FydeOS** `FydeOS_for_PC_iris_v23.0-SP1-io.bin`
|
||||
(`amd64-fydeos_iris-io`, `16700.56.23.51`), which replaced Flex.
|
||||
|
||||
## Why not just `dd` the image
|
||||
|
||||
@@ -111,7 +118,25 @@ Each of these broke an attempt during the 2026-09-27 install:
|
||||
The log must not be in `/tmp` if another user owns the file (root is
|
||||
denied by `fs.protected_regular`).
|
||||
|
||||
## Resulting layout (2026-09-27)
|
||||
## Resulting layout
|
||||
|
||||
FydeOS (current, 2026-09-27):
|
||||
|
||||
```
|
||||
mmcblk0 29.1G
|
||||
├─mmcblk0p1 23.7G ext4 STATE
|
||||
├─mmcblk0p2 16M KERN-A
|
||||
├─mmcblk0p3 2.7G ext4 ROOT-A
|
||||
├─mmcblk0p4 16M KERN-B
|
||||
├─mmcblk0p5 2.7G ext4 ROOT-B
|
||||
├─mmcblk0p6-7 512B KERN-C / ROOT-C
|
||||
├─mmcblk0p8 16M ext4 OEM
|
||||
├─mmcblk0p9-10 512B reserved / reserved
|
||||
├─mmcblk0p11 8M RWFW
|
||||
└─mmcblk0p12 32M vfat EFI-SYSTEM (UUID F35E-F13C, PARTUUID 18151E4F-...)
|
||||
```
|
||||
|
||||
ChromeOS Flex (2026-09-27, before FydeOS replaced it):
|
||||
|
||||
```
|
||||
mmcblk0 29.1G
|
||||
@@ -126,24 +151,26 @@ mmcblk0 29.1G
|
||||
└─mmcblk0p12 256M vfat EFI-SYSTEM (UUID CBE4-703E)
|
||||
```
|
||||
|
||||
The ESP is copied from the image, so its FAT UUID (`CBE4-703E`) survived
|
||||
the reinstall unchanged. The install itself left the UEFI boot entries
|
||||
The ESP is copied from the image, so its FAT UUID comes from the image:
|
||||
`CBE4-703E` for Flex (it survived the Flex reinstall unchanged) and
|
||||
`F35E-F13C` for FydeOS. The install itself left the UEFI boot entries
|
||||
and `BootOrder` untouched, but Flex's first auto-update changed them.
|
||||
See "Flex takes over the UEFI boot order on updates" below.
|
||||
|
||||
## Booting Flex
|
||||
## Booting ChromeOS (FydeOS)
|
||||
|
||||
Two ways:
|
||||
|
||||
1. **From GRUB** (neon's menu, shown for 5s): the entry "ChromeOS Flex
|
||||
(internal eMMC)" in `/etc/grub.d/40_custom` chainloads Flex's own EFI
|
||||
loader (`crdyboot`) from the eMMC's ESP:
|
||||
(internal eMMC)" in `/etc/grub.d/40_custom` chainloads the eMMC ESP's
|
||||
own loader: FydeOS's GRUB now (Flex's was `crdyboot`). The title was
|
||||
kept on purpose, since FydeOS is still ChromeOS.
|
||||
```
|
||||
menuentry "ChromeOS Flex (internal eMMC)" {
|
||||
insmod part_gpt
|
||||
insmod fat
|
||||
insmod chain
|
||||
search --no-floppy --fs-uuid --set=root CBE4-703E
|
||||
search --no-floppy --fs-uuid --set=root F35E-F13C
|
||||
chainloader /EFI/BOOT/BOOTX64.EFI
|
||||
}
|
||||
```
|
||||
@@ -153,7 +180,7 @@ Two ways:
|
||||
POST): `efibootmgr -v` shows `neon` (Boot0005, on the USB card) and
|
||||
`Internal eMMC` (Boot0001), with `BootOrder` `0005,0001,0000,0003,0002`.
|
||||
With the USB card unplugged, the firmware falls through to `Internal
|
||||
eMMC` and boots Flex with no menu.
|
||||
eMMC` and boots FydeOS with no menu.
|
||||
|
||||
## Flex takes over the UEFI boot order on updates
|
||||
|
||||
@@ -206,13 +233,20 @@ Ways to live with it (none implemented yet):
|
||||
- Deleting `Boot0004` doesn't help: the next update recreates it.
|
||||
Neon's GRUB entry chainloads the ESP directly and doesn't need it.
|
||||
|
||||
## Other ChromiumOS-based images: FydeOS
|
||||
After the FydeOS install, `Boot0004 "ChromeOS Flex"` was stale: it
|
||||
pointed at the old Flex ESP (PARTUUID `2877e60b…`, start sector
|
||||
`0x49000`), which no longer exists, so the firmware skipped it and fell
|
||||
through to neon. It was deleted 2026-09-27 (`efibootmgr -b 0004 -B`),
|
||||
which put `BootOrder` back to `0005,0001,0000,0003,0002`. Expect FydeOS
|
||||
to add its own entry, and move it first, after its first update.
|
||||
|
||||
Checked 2026-09-27, by reading the image only (not installed):
|
||||
## FydeOS
|
||||
|
||||
Checked 2026-09-27 by reading the image, then **installed the same day
|
||||
with `install-flex-emmc.sh` unchanged. It worked on the first try.**
|
||||
`FydeOS_for_PC_iris_v23.0-SP1-io.bin.zip` (board `amd64-fydeos_iris-io`,
|
||||
version `16700.56.23.51`), in `matt`'s `~/Downloads` (extracted copy in
|
||||
`~/fydeos-check`). **`install-flex-emmc.sh` should work with it
|
||||
unchanged.**
|
||||
`~/fydeos-check`).
|
||||
|
||||
- **Same installer image layout:** ROOT-A is p3 (2.7GB), ROOT-B is a
|
||||
2MB placeholder, the ESP is p12. The same `chromeos-install` (Rust)
|
||||
@@ -238,8 +272,8 @@ unchanged.**
|
||||
because Secure Boot is disabled on hp-chell (`mokutil --sb-state`).
|
||||
The image's ESP UUID is `F35E-F13C`.
|
||||
|
||||
Caveats before trying it:
|
||||
- It replaces Flex (same eMMC, full wipe).
|
||||
Notes:
|
||||
- It replaced Flex (same eMMC, full wipe).
|
||||
- The script rewrites the UUID in the `40_custom` entry titled
|
||||
"ChromeOS Flex", so FydeOS boots under that title. Decided
|
||||
2026-09-27 to keep it, since FydeOS is effectively still ChromeOS.
|
||||
@@ -255,4 +289,7 @@ Caveats before trying it:
|
||||
is normal for this class of eMMC). Booted as live/installer media, as
|
||||
explained above. The note at the time that Flex expands STATE on
|
||||
first boot was wrong.
|
||||
- **2026-09-27**: reinstalled properly with `install-flex-emmc.sh`.
|
||||
- **2026-09-27**: reinstalled Flex properly with `install-flex-emmc.sh`.
|
||||
It worked and auto-updated, but took over the UEFI boot order.
|
||||
- **2026-09-27**: switched to FydeOS (`iris` build) with the same
|
||||
script; deleted the stale Flex UEFI entry.
|
||||
|
||||
Reference in New Issue
Block a user