Compile only root filesystem like Buildroot

[Arınç ÜNAL]

Quoting me and Luiz's message.

> On 9.01.2023 05:17, Luiz Angelo Daros de Luca wrote:
>> Hi Arınç,
>> 
>>> Is it possible to create a root filesystem archive?
>> 
>> CONFIG_TARGET_ROOTFS_TARGZ ?
> 
> Ah, of course. Thanks.
> 
> OpenWrt filesystem hasn’t got /init. I get this error when I link the filesystem with the kernel.
> 
> [    3.495199] List of all partitions:
> [    3.498698] No filesystem could mount root, tried:
> [    3.498706]
> [    3.505060] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
> [    3.513308] ---[ end Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) ]---
> 
> Configuring CONFIG_DEFAULT_INIT to /sbin/init on kernel or adding init=/sbin/init to kernel command line surprisingly won’t change anything. So I put this as /init. Now it boots fine.
> 
> #!/bin/sh
> exec /sbin/init "$@"
> 
>> 
>>> Is there a directory
>>> where the final filesystem is extracted before turned to a squashfs image?
>> 
>> build_dir/target-mipsel_24kc_musl/root-ramips/ ?
>> 
>>>
>>> I know there's buildroot for this but I want to use LuCI, buildroot
>>> seems to only have uci.
>> 
>> BTW, I'm working back with rtl8365mb driver. I implemented forwarding
>> offload and mtu change but it breaks vlan security. We need a proper
>> vlan support before the HW does the forwarding. I'm working on that
>> right now.
> 
> Hey that's great! Not to put more work on you but could you take a look at supporting the BR_ISOLATED port flag once you're done? My folks did some work messing with the port matrix on mt7530.c to support port isolation for DSA interfaces on MT7530 and MT7531 switches.
> 
> 
> Arınç