[solved] 64bit on IBM ThikPad t40 type 2374 possible? -> NO!

Help with issues regarding installation of Debian

[solved] 64bit on IBM ThikPad t40 type 2374 possible? -> NO!

Postby Onsemeliot » 2019-10-05 10:31

Hi together,

I have just revived an old IBM ThinkPad T40 with the maximum RAM capacity of 2 GB and a Intel Pentium M processor with 2 GHz installed. Should I be able to run a 64 bit system there? I found out that I can't boot from USB even if it is listed as an available drive in the BIOS. I only ever can use my DVD drive for installation. I was able to install Debain Stretch 32 bit from a DVD I still had lying around and upgraded it to Debian Buster but when I tried a 32 bit Trisquel disc it complained that the kernel would need the PAE extension which my hardware doesn't seem to have. From what I could gather PAE would only be useful if I had more than 3 GB of RAM, which isn't even possible. But over all 64 bit seems to be the best option anyway.

Unfortunately so far I wasn't able to find any information if my processor should be able to run a 64 bit sytem. Can anyone of you help me finding out if it was sensible to burn an other DVD? (I don't want to waste an other blank.)
Last edited by Onsemeliot on 2019-10-05 12:06, edited 1 time in total.
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Re: 64bit on IBM ThikPad t40 type 2374 possible?

Postby arochester » 2019-10-05 10:47

https://www.computerhope.com/issues/ch001121.htm

if the computer has an older Pentium M, you may be able to use 'forcepae' on the kernel command line. https://www.circuidipity.com/pentium-m-pae/
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Re: 64bit on IBM ThikPad t40 type 2374 possible?

Postby p.H » 2019-10-05 11:28

Onsemeliot wrote:Should I be able to run a 64 bit system there?

No, the Pentium M is a 32-bit only processor.
Note that any 64-bit x86 processor would support PAE when running in 32-bit mode.

Onsemeliot wrote:I found out that I can't boot from USB even if it is listed as an available drive in the BIOS.

Did you prepare the USB drive properly for BIOS boot ? Did you select the USB drive in the boot menu (F12) ?

Onsemeliot wrote:From what I could gather PAE would only be useful if I had more than 3 GB of RAM

No, PAE support is also required to enable the XD/NX bit (data execution prevention).
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Re: 64bit on IBM ThikPad t40 type 2374 possible?

Postby Onsemeliot » 2019-10-05 12:05

The "forcepae" flag during installation solved the issue. Unfortunately I really can't use 64 bit with this hardware. But I guess it will be fine.

Thank you for the pointers. :)
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