Update rd.gz inplace

# Download cpio

```
wget -c https://alist.jim.plus/d/public/synology/tools/cpio -O /bin/cpio
chmod +x /bin/cpio
```

# Decompress

```
echo 1 > /proc/sys/kernel/syno_install_flag
mkdir -p /mnt/synoboot1
mkdir -p /mnt/synoboot2
mkdir -p /mnt/synoboot3
mount /dev/synoboot1 /mnt/synoboot1
mount /dev/synoboot2 /mnt/synoboot2
mount /dev/synoboot3 /mnt/synoboot3

ORI_RDGZ_FILE=/mnt/synoboot3/initrd-dsm

# decompress current rd.gz
RAMDISK_PATH=/root/tmp/ramdisk
mkdir -p "${RAMDISK_PATH}"
(cd "${RAMDISK_PATH}"; cat "${ORI_RDGZ_FILE}" | cpio -idm)
```

# Update ko

```
RAMDISK_PATH=/root/tmp/ramdisk
(cd /tmp && gzip -d rp-epyc7002-5.10.55-dev.ko.gz)
cp /tmp/rp-epyc7002-5.10.55-dev.ko "${RAMDISK_PATH}/usr/lib/modules/rp.ko"
```

# Update iwlwifi

```
wget -c https://alist.jim.plus/d/public/synology/drivers/sa6400-7.2/iwlwifi-2025-05-16.tgz

cd /root

pkg=iwlwifi-2025-05-16.tgz

if [ ! -f $pkg ]; then
  wget -O $pkg https://alist.jim.plus/d/public/synology/drivers/sa6400-7.2/$pkg
fi

md5=$(md5sum $pkg | awk '{print $1}')
if [ "$md5" != "a232e70f649b9fb4a81bcb01ddaaa2db" ]; then
  echo $pkg md5 mismatch
  exit 1
fi

tar -zxvf $pkg
cd iwlwifi
cp -vf firmware/* $RAMDISK_PATH/usr/lib/firmware/
cp -vf *.ko $RAMDISK_PATH/usr/lib/modules/
```

# Compress

```
RAMDISK_PATH=/root/tmp/ramdisk
ORI_RDGZ_FILE=/mnt/synoboot3/initrd-dsm
if [ ! -e /bin/depmod ]; then
  cp -l /bin/kmod /bin/depmod
fi
mv "${ORI_RDGZ_FILE}" "${ORI_RDGZ_FILE}.bak"
# update modules dependency
/bin/depmod -a -b ${RAMDISK_PATH}
(cd "${RAMDISK_PATH}" && find . | cpio -o -H newc -R root:root > "${ORI_RDGZ_FILE}")
```

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