[OpenWrt-Devel] Q: procd: re-evaluation of inittab entries

[John Crispin]

On 05/12/2018 03:52, Yousong Zhou wrote:
> On Wed, 5 Dec 2018 at 06:00, Michael Heimpold <mhei at heimpold.de> wrote:
>> Hi,
>>
>> I'm currently playing with USB gadget stuff. The goal is to run an Ethernet
>> link and a console over the USB link. I already selected the relevant kernel
>> modules and ACM device and RNDIS device is created on the USB host
>> system - all fine so far.
>> The ACM device on the USB gadget side is created as /dev/ttyGS0, and
>> when I use "echo foobar > /dev/ttyGS0" or "cat /dev/ttyGS0" on USB device
>> side with corresponding counterparts on USB host side, then it already works
>> like a charme.
>> My problem is the inittab: I think the right approach is to add an entry to
>> inittab when I want to provide a login console on this tty, so I added:
>> ttyGS0::askfirst:/usr/libexec/login.sh
>> at the end of my inittab.
>> However, during boot ttyGS0 is not yet available - it takes until the
>> USB gadget is setup. procd skips this line at boot time.
>>
>> So my question is: is this the correct approach, or should I use a
>> hotplug script to start such a console?
> I think we should make it possible to use serial console directly in inittab.
>
> In this case, could it be that the kernel module was only loaded after
> parsing inittab and askfirst quitted because it couldn't find the
> device?  Please check if that is the case by grepping module name in
> /etc/modules-boot.d/ .  Setting boot flag when calling AutoProbe
> should fix the issue.
>
>                  yousong

This would be the correct approach actually, i just checked the code, 
preinit will only spawn the early_console, then load 
/etc/modules-boot.d/* and then spawn the real procd which will parse inittab

     John


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