Re: [Xen-users] serial console to Dom0 -- connection, but only 'garbage' (� , 'question mark') output. config wrong?

[Sarah Newman <srn@xxxxxxxxx>]

On 1/31/20 6:24 PM, PGNet Dev wrote:
> On 1/31/20 6:01 PM, Sarah Newman wrote:
> > That is correct usage.
> gr8
>
> > You shouldn't expect the serial port you're asking Xen to use to be exposed in 
> > Linux.
> my goal here is to get all the server's boot logs -- kernel & xen -- into a remote 
> terminal, as well as early access/control of BIOS & grub.
>
> > You have to go through hvc0 instead.
> if "go through" hvc0 means writing to it (?),
>
> checking, on the server
>
>         dmesg | grep hvc
>                 [    1.823193] printk: console [hvc0] enabled
>                 [   21.773282] systemd[1]: Found device /dev/hvc0.
>                 [   50.136976] systemd[1]: Started Serial Getty on hvc0.
>
>         stty -F /dev/hvc0
>                 speed 38400 baud; line = 0;
>                 min = 1; time = 0;
>                 -brkint -icrnl -imaxbel
>                 -isig -icanon -iexten -echo -echoe -echok -echoctl -echoke
>
> not sure where that baud rate comes from -- or can be (re)set
>
> attempting to change fails,
>
>         /bin/stty -F /dev/hvc0 115200
>                 /bin/stty: /dev/hvc0: unable to perform all requested operations
>
> and writes to it on server aren't making it to my desktop terminal at all -- 
> whether 'minicom' baud rate is set to 115200 or 38400
>
> i.e., on server,
>
>         echo -e "test" > /dev/hvc0
>
> succeeds (no error/hang), but NO data at desktop/minicom.
>
>
> I *am* assuming this^^ is all the correct approach.  If not, what is?
Are you getting the Xen boot messages on minicom? That's where you should start.

Usually when I have problems with minicom it's because I forgot to disable flow 
control.


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