ChanServ changed the topic of #armlinux to: ARM kernel talk [Upstream kernel, find your vendor forums for questions about their kernels] | https://libera.irclog.whitequark.org/armlinux
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<ukleinek> mmind00: the Debian kernel has CONFIG_PINCTRL_ROCKCHIP=m which isn't enough to bring up the initial console.
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<ukleinek> Is it expected that after "Warning: unable to open an initial console." the machine doesn't boot?
<ukleinek> the pinctrl-rockchip module is in the initramfs, so it could work.
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<geertu> ukleinek: I think init needs /dev/console
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* ukleinek would expect that it's possible to implement init in a way that it doesn't, but that dependency is indeed the most suspicious explanation
<geertu> However, I'd expect /dev/console to exist even if it is not backed by a physical one.
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<geertu> Assumed CONFIG_DEVTMPFS_MOUNT=y, ofc
<ukleinek> ..ooOO(How to debug that?)
<javierm> ukleinek: how did you create your initramfs? If using dracut, you could add rd.debug to your kernel cmdline param
<javierm> probably there's something similar for initramfs-tools ?
<ukleinek> javierm: in the hope the debug output doesn't go to /dev/console ...
<geertu> ukleinek: Replace printk() by a function that writes to a buffer in RAM, and inspect that buffer from U-Boot after reboot?
<geertu> Or by a function that writes to the serial port, if available. Or to an LED.
<ukleinek> ..ooOO(Or enable PINCTRL_ROCKCHIP=y for the Debian kernel)
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<geertu> Does earlycon keep_bootcon work?
<javierm> geertu: did you try increasing the deferred_probe_timeout? e.g: deferred_probe_timeout=60
<geertu> The GKS way is to have everything modular
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<javierm> err, it was for ukleinek ^
<geertu> javierm: Why would I do that?
<geertu> ;-)
<javierm> geertu :D yes, the comment was meant for ukleinek
<javierm> ukleinek: we also have the same problem with Fedora... most pinctrl, pd, clock, etc drivers have to be built-in...
<javierm> it has gotten even worse now that there's a default 10 secounds timeout for deferred probe :/
<ukleinek> ah, earlycon was that other parameter I wanted.
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* ukleinek used ignore_loglevel earlyprintk
<ukleinek> doesn't help though.
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<biju> earlyprintk is for arm32 right? you need to enables some serial config for early printk.
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<arnd> yes, earlyprintk/debug_ll is meant to be even earlier than earlycon, so it requires compile-time configuration to avoid relying on DT parsing. earlycon is almost always better since you can have it enabled in a portable kernel
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<robmur01> geertu: "Replace printk() by a function that writes to a buffer in RAM" - what, you've never grovelled __log_buf itself? ;)
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<ukleinek> geertu, javierm: If I drop console=ttyS2,115200 from bootargs, the machine boots even with PINCTRL_ROCKCHIP=m
<ukleinek> I don't get a getty on ttyS2 then though
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<javierm> ukleinek: interesting...
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<ukleinek> mmind00: I hit:
<ukleinek> [ 1344.667464] of_dma_request_slave_channel: dma-names property of node '/serial@fe660000' missing or empty
<ukleinek> [ 1344.678170] dw-apb-uart fe660000.serial: failed to request DMA
<ukleinek> I wonder if (non-console) operation of the UARTs work for someone on rk356x
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<robmur01> no reason they shouldn't work in non-DMA mode, it's the same path as when DMA is explicitly ignored for the console port
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<ukleinek> robmur01: hmm, you're right. So much to test ...
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<ukleinek> robmur01: so the tty works indeed, but the bdrate is reset to 9.6k so I didn't see output
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