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From: Tamas K Lengyel <tamas@tklengyel.com>
To: "Marek Marczykowski-Górecki" <marmarek@invisiblethingslab.com>
Cc: Xen-devel <xen-devel@lists.xenproject.org>
Subject: Console output stops on dbgp=xhci
Date: Wed, 14 Sep 2022 14:18:34 -0400	[thread overview]
Message-ID: <CABfawhmXWouFVRVrtX82Dh+8maaJqnDSDL=Me7_fzBGdM4oE2Q@mail.gmail.com> (raw)

Hi Marek,
I'm testing the latest Xen master git branch
(942ac5fc15ecc2f7ef1d9331c76d89d2cef10e5c) with the now merged xue
patches.  My current boot command line includes dbgp=xhci@pci00:14.0
console=dbgp and this works in that the Xen boot log shows up on the
other side of the debug cable:

...

(XEN) Dom0 has maximum 8 VCPUs

(XEN) ELF: phdr 0 at 0xffffffff81000000 -> 0xffffffff82c5cdac

(XEN) ELF: phdr 1 at 0xffffffff82e00000 -> 0xffffffff831a1000

(XEN) ELF: phdr 2 at 0xffffffff831a1000 -> 0xffffffff831d5000

(XEN) ELF: phdr 3 at 0xffffffff831d5000 -> 0xffffffff84000000

However, debug output on the USB3 port stops at this point. I would
expect to see the same as xl dmesg shows:

(XEN) Dom0 has maximum 8 VCPUs
(XEN) ELF: phdr 0 at 0xffffffff81000000 -> 0xffffffff82c5cdac
(XEN) ELF: phdr 1 at 0xffffffff82e00000 -> 0xffffffff831a1000
(XEN) ELF: phdr 2 at 0xffffffff831a1000 -> 0xffffffff831d5000
(XEN) ELF: phdr 3 at 0xffffffff831d5000 -> 0xffffffff84000000
(XEN) Initial low memory virq threshold set at 0x4000 pages.
(XEN) Scrubbing Free RAM in background
(XEN) Std. Loglevel: All
(XEN) Guest Loglevel: All
(XEN) *** Serial input to DOM0 (type 'CTRL-a' three times to switch input)
(XEN) Freed 2048kB init memory
...

Do you have any idea what might be going on and preventing the output
from showing over USB3 afterwards? The /dev/ttyUSB0 device is still
present on the receiving side, just nothing is being received over it.

Thanks,
Tamas


             reply	other threads:[~2022-09-14 18:19 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-14 18:18 Tamas K Lengyel [this message]
2022-09-14 21:57 ` Console output stops on dbgp=xhci Marek Marczykowski-Górecki
2022-09-15  0:41   ` Tamas K Lengyel
2022-09-15  1:28     ` Marek Marczykowski-Górecki
2022-09-15  7:55     ` Jan Beulich
2022-09-15 14:05       ` Tamas K Lengyel
2022-09-15 14:10         ` Jan Beulich
2022-09-15 14:16           ` Tamas K Lengyel
2022-09-15 14:39             ` Jan Beulich
2022-09-15 16:48               ` Tamas K Lengyel
2022-09-16  5:57                 ` Jan Beulich
2022-09-16  9:53                   ` Default reboot method (was: Re: Console output stops on dbgp=xhci) Marek Marczykowski-Górecki
2022-09-16 10:28                     ` Jan Beulich
2022-09-16 10:55                       ` Marek Marczykowski-Górecki
2022-09-16 11:10                         ` Roger Pau Monné
2022-09-16 11:44                         ` Jan Beulich

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