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 <[email protected]> Sent: Monday, April 14, 2025 4:05 PM To: Richard Clark <[email protected]>; [email protected] Cc: Bud Wykoff <[email protected]> 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 <[email protected]> > Sent: Monday, April 14, 2025 12:49 AM > To: Richard Clark <[email protected]>; > [email protected] > Cc: Bud Wykoff <[email protected]> > 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 _______________________________________________ l4-hackers mailing list -- [email protected] To unsubscribe send an email to [email protected]
