Adam,
That change certainly makes it a lot better! Now it (ttyS0 configuration) gets to the same point as the hvc0 configuration. I get the login: message, and a # prompt, but it will not take input. Maybe I'm missing a qemu flag? Or a connection from cons to the vm in the cfg file?
So close. Both hvc0 and ttyS0 now display a #, but there is no input.
Thanks!
Richard
-----Original Message----- From: Adam Lackorzynski adam@l4re.org Sent: Monday, April 14, 2025 4:05 PM To: Richard Clark richard.clark@Coheretechnology.us; l4-hackers@os.inf.tu-dresden.de Cc: Bud Wykoff bud.wykoff@Coheretechnology.us Subject: Re: Linux console?
Hi Richard,
your dts has the 'l4vmm,vcon_cap = "uart";' enabled (not commented out), thus the 8250 UART emulation in uvmm looks for a "uart" capability which is not there and thus disables the virtual UART. Removing that line or commenting it out will make this work I believe as the standard capability will be used then.
Adam
On Mon Apr 14, 2025 at 11:57:32 +0000, Richard Clark wrote:
Adam,
Yes the vm-basic.cfg is where I started.
I am attaching a tgz file with two directories showing the two different outputs that I get when trying to run hvc0 and ttyS0. Included are the config files, the ramdisk, and the dts as well.
Richard
-----Original Message----- From: Adam Lackorzynski adam@l4re.org Sent: Monday, April 14, 2025 12:49 AM To: Richard Clark richard.clark@Coheretechnology.us; l4-hackers@os.inf.tu-dresden.de Cc: Bud Wykoff bud.wykoff@Coheretechnology.us Subject: Re: Linux console?
Hi Richard,
On Fri Apr 11, 2025 at 15:27:18 +0000, Richard Clark wrote:
L4Re,
I’ve been working with the examples and tweaking them for AMD64 (QEMU), and I’ve managed to get linux up and booting, reading the ramdisk, and even spawning a login process which kicks off /bin/sh and displays a # prompt. And that’s great, but that’s all it does. I can’t get any input to it. That’s using the device hvc0. Of course uvmm complains that there is no virtual console and warns that it might not work, so the software is at least not surprised! 😊 But when I try to use the device ttyS0, linux stops printing even before the login process tries to run. I don’t get any errors, but also no output. And I can’t seem to run the IO server because then linux won’t load at all (something about out-of-memory).
I’m sure I’m missing some little piece of magic somewhere, but I can’t find any working examples. None of them have active logins (I had to add my own iniittab to the ramdisk). A little help connecting the cons service to my linux so I can get a real bash shell? Or running IO and connecting through that?
Did you try to run for example the "VM-basic" entry that is there? That is supposed to be a minimal working example. Please also provide the output from the system you're getting, that is helping understanding what's going on.
Thanks, Adam
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