[OpenWrt-Devel] [PATCH 0/7] procd: console hotplugging support

[Karl Palsson]

Hi,

I'll save that for when I get back to it :)

Here's how I packaged the g_cdc (ethernet+cdc-acm together)

https://github.com/karlp/openwrt/commit/40c791f5bfbbf6825087db2fc87f88a73f7fa94c

I've got a few other patches for gadgetmode, but some of it needs
a bitmore testing yet, so I've not proposed it to openwrt yet.

Cheers,
Karl P


Michael Heimpold <mhei at heimpold.de> wrote:
> Hi Karl,
> 
> if you want to test it, here are the missing pieces roughly
> explained:
> - I used kmod-usb-gadget-eth and kmod-usb-gadget-serial
>   I know that there is another (older?) kernel module which also provides
>   a network and console interface at the same time, but this must be
>   configured via kernel command line parameter if I understand correctly
>   so I've chosen to test this configfs approach
> - add a line to inittab like this:
>    ttyGS0::askfirst:/usr/libexec/login.sh
> - patch /etc/hotplug.json on your device like this:
> 
> diff --git a/package/system/procd/files/hotplug.json
> b/package/system/procd/
> files/hotplug.json                                             
> index 1c949bbea3..25806637cc 100644                                                                                                        
> --- a/package/system/procd/files/hotplug.json                                                                                              
> +++ b/package/system/procd/files/hotplug.json                                                                                              
> @@ -33,6 +33,10 @@                                                                                                                         
>                                         [ "load-firmware", "/lib/firmware" ],                                                              
>                                         [ "return" ]                                                                                       
>                                 ]                                                                                                          
> +                 ],                                                                                                                       
> +                 [ "if",                                                                                                                  
> +                         [ "regex", "DEVNAME", "^tty[A-Za-z0-9]" ],                                                                       
> +                         [ "start-console", "%DEVNAME%" ]                                                                                 
>                         ]                                                                                                                  
>                 ],                                                                                                                         
>                 "remove" : [
> 
> - I used a shell script found at 
> http://irq5.io/2016/12/22/raspberry-pi-zero-as-multiple-usb-gadgets/
>  to configure the gadget
> 
> I'll send a patch for hotplug.json after I got some feedback
> for this procd stuff or better - in case this is merged,
> because otherwise we have a dependency issue otherwise...
> Another point on my list is auto-mounting of configfs to the
> right place. I'm feeling that this should not be part of the
> shell script but be done at a central place - still unsure
> where to put it because configfs is an optional kernel module
> and thus available later during boot...
> 
> Best regards,
> Michael
> 
> Am Mittwoch, 2. Januar 2019, 12:38:30 CET schrieb Karl Palsson:
> > Michael Heimpold <mhei at heimpold.de> wrote:
> > > This series extends procd to allow starting consoles for
> > > devices which are not present during boot or after kernel
> > > module loading. This is for example the case when a USB gadget
> > > serial device is created with configfs. Here the kernel module
> > > is loaded but the tty device only appears after gadget is
> > > configured. Having a console configured in inittab for e.g.
> > > ttyGS0 does not work at the moment due to late appearing of
> > > this device.
> > 
> > Thanks for doing this, I had been planning on using this (console
> > on gadget serial), and didn't even know it didn't work (yet)
> > until your mails! Much appreciated!
> > 
> > Cheers,
> > Karl P
> 
> 
> 
> 
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