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Hello, Karl. |
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Thanks for the reply. |
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On Fri, Apr 02, 2021 at 21:32:04 +0200, karl@××××××××.se wrote: |
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> Alan Mackenzie: |
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> ... |
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> > I've now cobbled together a working console scroll on Linux |
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> > 5.4.80-gentoo-r1. In the end, I reused much of the old machinery which |
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> > was still present in 4.19.97. Once I've tidied it up, I hope that the |
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> > resulting patch file will apply cleanly also to later versions than |
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> > 5.4.80-r1. |
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> ... |
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> Nice, where is the patch so I can try ? |
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I've attached a patch to this post. To apply it, the following seems to |
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work from the top directory of a kernel source tree, e.g. 5.4.80-r1: |
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$ patch -p0 < diff.20210402.diff |
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.. Then you'll need to run make menuconfig (or whatever), going down to |
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Device Drivers/Graphic support/Console display driver support and there |
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accepting the defaults for the new config variables. (This is assuming |
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you've got FRAMEBUFFER support enabled in a neighbouring page.) |
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Then build the kernel as normal, and put the new version into whatever |
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boot loader you use. It should (??) run, with a scrollback buffer on |
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each virtual terminal. |
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Just a word about the current state of the source - it is rough, with |
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things unfinished. The "word" STOUGH (pronounced "stuff") is just a |
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word I use which appears nowhere else and enables me to find changes |
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quickly and unambiguously. |
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As I said, I'm not finished with the changes, and swapping from and back |
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to a scrolled tty isn't completely satisfactory. Nevertheless, I hope |
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it works for you and you have fun with it. |
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> > (i) The scrolling doesn't work on /dev/tty1 aka the console. |
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> > (ii) When, e.g., /dev/tty6 has been scrolled upwards a bit, and then |
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> > <Alt><F2> pressed to go to /dev/tty2, on returning to /dev/tty6, the |
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> > scrolling has been cancelled and the cursor is no longer visible. |
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> > However, the scrollback buffer is still present. |
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> > |
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> > I think I'm fairly likely to be able to solve (ii). However, (i), the |
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> > problem with /dev/tty1, has me baffled. I don't know where to start |
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> > looking for the problem. If anybody with some kernel knowledge could |
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> > make any suggestions, I'd be very grateful. |
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> What happens if you set /dev/console to be /dev/ttyS0, i.e. make sure |
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> that tty1 is the only one using the first virtual console. |
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I will try than. Thanks! |
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> Regards, |
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> /Karl Hammar |
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-- |
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Alan Mackenzie (Nuremberg, Germany). |
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