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[Qemu-devel] [Bug 922076] Re: doesn't clear screen on boot
From: |
Askar Safin |
Subject: |
[Qemu-devel] [Bug 922076] Re: doesn't clear screen on boot |
Date: |
Sun, 31 Mar 2013 15:53:21 -0000 |
UPDATE: The second bug (which is started with "Also, I found another
bug! I am learning...") is fixed in 1.4.0
About the first bug: screen clears on real hardware, so it is really
bug. Also, it is reproducible with Qemu 1.4.0 and Qemu
5e3a0f418c4d57399778cee0b55aebfb663b6425.
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https://bugs.launchpad.net/bugs/922076
Title:
doesn't clear screen on boot
Status in QEMU:
New
Bug description:
When I start Linux in Qemu via "qemu -kernel /vmlinuz ...", opens Qemu
window, it shows message "Starting Seabios (version 0.5.1-2010...)",
and then Linux writes messages like "Loading, please wait..." on top
of previous message!
For example, I can see "Loading, please wait...on 0.5.1-2010...)"
So, Qemu doesn't clean screan before booting OS.
Moreover, when I start Linux via "qemu /disk-image", Qemu shows
"Starting Seabios (version 0.5.1-2010...)", then switches to graphical
mode, shows GRUB, then switches back to text mode and shows "Starting
Seabios" again! And again Linux prints messages on top of Seabios
messages, and we see a mix of symbols on screen.
Also, I found another bug! I am learning now to write kernels. And I
see that operator "*(char *)0xb8000 = 0" in C code of kernel doesn't
clean first charaster of screen in Qemu in "-curses" mode! If I want
to real clean this charaster, I must type "*(char *)0xb8000 = ' '".
I attach a kernel (x86, multiboot) with this bug. Just type "make"
(you need gcc) and "qemu -curses -kernel kernel". You will see that
screen is not cleared, but kernel tries to clean it. If you change 0
to ' ', all will work!
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