[systemd-devel] systemd doesn't see ttyPS0 devices from udev

[Mantas Mikulėnas]

On Tue, Sep 22, 2020 at 1:46 PM Andrei Borzenkov <arvidjaar at gmail.com>
wrote:

> On Tue, Sep 22, 2020 at 1:35 PM ZhouPeng <zhoupengwork01 at 163.com> wrote:
> >
> > Hi all,
> >
> > When I use Fedora image as rootfs on Xilinx PYNQ-Z2, I encountered the
> issue  when use the /dev/ttyPS0.
> > I think the issue is because systemd and udev on fedora can didn't
> detect ttyPS0 properly. Do I need to install any other package or do some
> special configuration?
> >
> > **systemd version the issue has been seen with**
> > udevadm --version
> > 237
> > systemd-udev.riscv64                     237-1.0.riscv64.fc28
> >
> >
> > **Unexpected behaviour you saw**
> > We can see ttyPS0 boots ok in the kernel boot period:
> > [    0.180000] console [ttyPS0] enabledat MMIO 0xe0000000 (irq = 2,
> base_baud = 6250000) is a xuartps
> > [    0.180000] console [ttyPS0] enabled
> >
> > But, when boot into systemd, it failed on dev ttyPS0:
> > [ TIME ] Timed out waiting for device dev-ttyPS0.device. // **here**
>
> systemd only monitors for devices with "sysemd" tag. Tags are assigned
> by udev rules. You should add rule to assign tag to ttyPS0. I have no
> idea what it is, but something like
>
> ACTION!="remove", KERNEL=="ttyPS0", TAG+="systemd"
>
> should do it. Whether this should go upstream depends on how common
> this device is.


Well yes, but that should have been already covered by the existing
upstream rules:

99-systemd.rules:12:SUBSYSTEM=="tty",
KERNEL=="*tty[a-zA-Z]**|hvc*|xvc*|hvsi*|ttysclp*|sclp_line*|3270/tty[0-9]*",
TAG+="systemd"

-- 
Mantas Mikulėnas
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