New: The computer seems to hang after the kernel has uncompressed and starts to boot.

New: The computer seems to hang after the kernel has uncompressed and starts to boot.

Post by Martin J. Blig » Sun, 09 Feb 2003 22:40:11



http://bugme.osdl.org/show_bug.cgi?id=328

           Summary: The computer seems to hang after the kernel has
                    uncompressed and starts to boot.
    Kernel Version: 2.5.59
            Status: NEW
          Severity: normal


Distribution: RedHat 8.0
Hardware Environment: Acer Aspire 1300 laptop
Software Environment: RedHat 8.0, GCC 3.2, LILO
Problem Description: When I have compiled the kernel without problems and
restart the computer the only two lines that are printed are:

Booting 2.5.59
Uncompressing the kernel, Ok booting the kernel

then there is no more text printed out and the keyboard do not work. But I
can  see some activity on the harddisk for about 10 seconds. When I reset
the  computer fsck is run because the disk was not cleanly unmounted. It
seems like  the system can almost boot but I can't see anything on the
screen.

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New: The computer seems to hang after the kernel has uncompressed and starts to boot.

Post by Thomas Molin » Sun, 09 Feb 2003 23:10:09



> http://bugme.osdl.org/show_bug.cgi?id=328

>            Summary: The computer seems to hang after the kernel has
>                     uncompressed and starts to boot.
>     Kernel Version: 2.5.59
>             Status: NEW
>           Severity: normal


> Distribution: RedHat 8.0
> Hardware Environment: Acer Aspire 1300 laptop
> Software Environment: RedHat 8.0, GCC 3.2, LILO
> Problem Description: When I have compiled the kernel without problems and
> restart the computer the only two lines that are printed are:

> Booting 2.5.59
> Uncompressing the kernel, Ok booting the kernel

> then there is no more text printed out and the keyboard do not work. But I
> can  see some activity on the harddisk for about 10 seconds. When I reset
> the  computer fsck is run because the disk was not cleanly unmounted. It
> seems like  the system can almost boot but I can't see anything on the
> screen.

I began to see this bug this weekend myself.  I'm not sure of the cause,
but it can be worked around by configuring the kernel for built-in (not
modular) support of virtual terminals (CONFIG_VT) and support for console
on virtual terminals (CONFIG_VT_CONSOLE).  

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New: The computer seems to hang after the kernel has uncompressed and starts to boot.

Post by Andries Brouwe » Mon, 10 Feb 2003 00:30:06



> I began to see this bug this weekend myself.  I'm not sure of the cause,
> but it can be worked around by configuring the kernel for built-in (not
> modular) support of virtual terminals (CONFIG_VT) and support for console
> on virtual terminals (CONFIG_VT_CONSOLE).  

Maybe unrelated, but there is some really ugly code in
char_dev.c:get_chrfops().

There, if one needs a character device that is not present
a request_module("char-major-%d") is done.
However, if the character device has TTY_MAJOR or TTYAUX_MAJOR
and a driver for this major is requested, and we already have
one, but it is the wrong one, then we also do the request_module.
Yecch.

The reason is of course that entirely different drivers cover
different fragments of the major space (4,1 is /dev/tty1 and
4,65 is /dev/ttyS1)

So, I could imagine that if one has neither module, and needs
one, get_chrfops() loads the wrong one. Speculation.

Andries
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1. Booting an uncompressed kernel.. is it possible?

Hi,

I'm wondering if it's possible to boot an uncompressed kernel image. I'm
playing with kernels inside Bochs <http://www.bochs.org/> and the uncompress
phase of bootup is the longest. I'm not familiar enough with the structure
of the boot image, but it seems to me that all I need is:

x86 bootsect + kernel object code (piggy.o?) and not
x86 bootsect + ungzip + ...

It seems that the need for compressing kernels is basically gone in any
case, unless you want to boot from floppy. Even in this case, it's a tight
squeeze. It would be good to have the option of building uncompressed
kernels for hard disk or net boot.

..mzn

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