OS/2, eCS & ArcaOS - Technical > Programming
OS/4 kernel and extended KEE
Doug Bissett:
I gave 4033 a try on my Lenovo ThinkPad L530. When I select any option from OS2LDR, it starts, the screen goes black for about half a second, and the machine reboots.
Using showmem=1 causes it to show a bit of interesting data, but it goes black, and reboots, after pressing a key (even when I select to boot the normal kernel). No sign of a log file, and I don't have a com port to play with.
It is possible that I didn't set it up properly. The instructions are about as clear as mud.
walking_x:
This model has supplied with EFI BIOS and 1155 socket CPU?
Then this is the second side of famous 512Mb bug ;)
IBM OS2LDR does not see memory above this border - and this is bad :)
OS/4 loader can see it, but something wrong with memory tables or BIOS or ACPI implementation on EFI... wrong in BIOS - the same bug exists on most of new chipsets... but I'm also saw messages about successful working of all 4Gb on EFI...
I'm think - OS/4 Team may trace kernel's execution on this place if they can get new PC with the same bug.
Just add MEMLIMIT=512 to OS2LDR.INI for now...
Doug Bissett:
--- Quote from: walking_x on June 13, 2013, 04:32:08 pm ---This model has supplied with EFI BIOS and 1155 socket CPU?
Then this is the second side of famous 512Mb bug ;)
--- End quote ---
It is EFI BIOS, I am not sure if it is 1155 socket CPU. Yes, it is the famous 512 MB bug.
--- Quote from: walking_x on June 13, 2013, 04:32:08 pm ---IBM OS2LDR does not see memory above this border - and this is bad :)
--- End quote ---
Well, it is not real bad. eCS operates reasonably well in 512 MB.
--- Quote from: walking_x on June 13, 2013, 04:32:08 pm ---OS/4 loader can see it, but something wrong with memory tables or BIOS or ACPI implementation on EFI... wrong in BIOS - the same bug exists on most of new chipsets... but I'm also saw messages about successful working of all 4Gb on EFI...
I'm think - OS/4 Team may trace kernel's execution on this place if they can get new PC with the same bug.
Just add MEMLIMIT=512 to OS2LDR.INI for now...
--- End quote ---
From what I have found out, there is a 4KB memory hole, for some unknown reason, at the 512 MB location. The rest of the memory holes seem to be above the 3 GB mark.
Adding memlimit=512 to OS2LDR.INI changes nothing. I will try some other things, when I find the time (which may not be soon).
Doug Bissett:
Just as a quick test, to be sure that I have it installed properly, I put this on my Lenovo ThinkPad T510. It seems to work fine, so I am now confident that I have installed it properly on the L530.
walking_x:
--- Quote from: Doug Bissett on June 13, 2013, 05:55:41 pm ---Adding memlimit=512 to OS2LDR.INI changes nothing. I will try some other things, when I find the time (which may not be soon).
--- End quote ---
This is actually strange, 512mb memory limit always helps.
May be 511 or 510? I'm don't know how it calculates - with or without 1st mb.
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