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Old 12-24-2016, 07:02 AM   #1
Mr486
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Kernel 2.0.40: Loading...... bootloader boot loop


Hi, On a 486, I am booting linux 2.0.40 from a floppy but wonder if I have done something wrong in the building of the kernel image + bootloader:

zImage has been written to the disk.

I get the Loading...... (presubably from linux/boot/head.S"

Then the computer reboots itself straight after the last "." (i.e. I don't get the "Uncompressing Linux" message (from arch/i386/boot/compressed)

What could be the most likely reasons for the reboot?

I made the Kernel with

make menuconfig (choose some options....)
make dep ; make clean
make zdisk (kernel gets built then the floppy disk goes chug chug for a while)


Thanks in advance...
 
Old 12-24-2016, 07:09 AM   #2
Mr486
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The output from the building of the kernel is:

tools/build bootsect setup compressed /vmlinux.out CURRENT > zImage
Root Device is (22,1)
Boot Sector is 512 bytes
Setup is 4380 bytes
System is 285 bytes
sync
Leaving .....arch/i386/boot

I used to be able to build bootable floppies without issue but something must have changed.....
 
Old 12-24-2016, 08:29 AM   #3
Mr486
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Any help/pointer appreciated. I am guessing the issue is nothing to do with the kernel as such but something to do with the bootloader not being happy?
 
Old 12-24-2016, 12:10 PM   #4
John VV
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so is this computer also from the erly 1990's

the 2.0 kernel is 20 years old
 
Old 12-25-2016, 05:37 AM   #5
Mr486
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ye it is an old 486. I needed to rebuild the kernel because of a change of network card.

Its 2.0.40 running on 486 building kernels and booting of floppies used to work fine on this machine - last build was done about 18 months ago.

I don't know all the caused of getting a reboot after "Loading.........." but before "Uncompressing Linux" that suggests that the bootloader has some problem?
 
Old 01-04-2017, 03:44 AM   #6
Mr486
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My latest attempt is that I have grabbed an archive of the 2.0.20 kernel and created a bare minimum kernel and built a zImage and copied to a floppy. That still has the issue of the computer rebooting right before the "Uncompressing Linux" message. I blank the floppy first to made sure the image that I create is the image that is the one on the floppy.

I have now had the idea to copy vmlinux straight to the floppy....That will get round the need to uncompress the kernel.... I haven't had a chance to try that yet.

Any ideas still welcome.
 
Old 01-05-2017, 03:11 AM   #7
Mr486
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Here is an update: The vmlinux idea didn't work as the machine started reading the disk and then just got stuck at a blank screen.

The last time I built a successful floppy was November 2015 which was kernel 2.0.40

I am guessing the issue must be some environmental wherby something goes wrong creating the zImage/vmlinux. If any old hands have any ideas that would be really helpful.

What I am going to try now is to build a zImage on a different system (build a kernel targeted at 486). That should be a way to create a successful bootable image.

Thanks for spending the time looking at this question.
 
Old 01-06-2017, 07:21 AM   #8
fatmac
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How old is the floppy disk - maybe some bad sectors?
 
  


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