Hallo,
ok I went through it. I tried SVN revision 4160. I copied OS4APIC.PSD and CLOCK03b.SYS to \OS2\boot. I created a custom CONFIG.OS4 file to load OS4APIC.PSD with the /APIC switch.
I enabled "preload=1" in os2ldr.ini
1) both, the OS/4 debug and also retail kernel trapped when they encountered valid CONFIG.SYS statements. In my case, that was the STRACE statement. It's the statement to control performance tracing in OS/2, see \OS2\BOOK\STRACE.INF.
That leads me to believe that the kernel will also trap on other statements it does not recognize and therefore it is incompatible with the existing kernel.
It should also be stated that with the performance tracing, IBM added a bit array to control which strace codes will be active or not (much like the bit array that exists for the trace codes) to the global info segment. I wonder if the OS/4 kernel also has this addition ...
2) I then removed the STRACE statements. The kernel would start to load showing it has initialized 1 CPU at "stage 2". Then it would sit there doing nothing. This was true for both, the debug and retail kernel. I had to power down the system.
3) I then stripped down CONFIG.SYS to the bare minimum. This time the kernel would start to load drivers but would hang when loading IBMKBD.SYS. Again, I had to power down the system.
I had the boot logo turned off via os2ldr.ini but I doubt that that would make a difference.
I have a pretty old box, about 5 to 7 years old, nothing fancy. It has only 1 (Intel) core. It's with MMX and SSE.
From what I can say, I would think that the new loader OS2LDR is ok (this was also true for QSINIT) but the OS/4 kernel is not.
This is my os2ldr.ini (beware of messed up line breaks):
[config]
; Kernel number from kernel list section to be loaded by default
default=1
; Waiting time (in seconds) after which kernel mentioned in "default"
; will be loaded
timeout=15
; Debug options
;dbflags=0x11
dbflags=0
; Debug port
; com port address
; no debug output if statment is omited (but log still accessible
; through copy from oemhlp$ - see below)
;dbport=0x3f8
;dbport=0xEC00
; Enable Ctrl-C check for kernel debugger. This is optional for kernels
; beginning from revision 2970. Older kernels always have this check enabled.
; This option ignored if no debug port specified.
; Ctrl-C check allows KDB popup when Ctrl-C is passed via serial link but
; adds two problems:
; - frequent serial port reads cause overall performance degradation
; - the serial port can't be used for something else except KDB because these
; reads destroy data which are received by the port
;ctrlc=1
; You have full COM port link cable (with hardware flow control support)
fullcable=1
; Show PC memory table as it reported by BIOS, do nothing if absent
; or defined as 0.
; Warning: this option will make PAUSE on boot!
;showmem=1
; Hide from OS/2 one of memory blocks from list above.
; Block specified by start address (>1Mb, block at 1Mb required for OS/2
; boot).
; You can add up to five such keys into [config] section.
; note: OS2LDR ignore too small blocks (<64k) by itself.
;removemem=0x20000000
; Color values for the startup menu
; byte 0 - text color
; byte 1 - color of selected row
; byte 2 - background color
; byte 3 - border color
; defauls are:
;menupalette=0x0F070F01
; Show b/w tty style menu with ugly kernel selection by numeric key
; It use BIOS text output only, so suitable for some strange reasons.
;ttymenu = 1
; Reset video mode to default 80x25, before menu output (fix for some
; strange BIOS bugs too)
;resetmode=1
; OS/4 kernel only (rev>=2075)
; Turn on memory files. Kernel will preload all files, located in:
; - BASEDEV and PSD statements of config.sys
; - os4krnl.ini
; - snoop.lst
; - and predefined list of files: PREVIOUS.DAT, ISAPNP.SYS, ISAPNP.SNP,
; RESOURCE.SYS, CLOCK01.SYS, SCREEN01.SYS, KBDBASE.SYS, SNOOP.LST,
; PNP.SYS, ACPI.CFG, IBMKBD.SNP, PCIBUS.SNP, PREVIOUS.ACP, PCIDEV.TBL
;
preload = 1
[kernel]
os2ldr.ibm = IBM OS2LDR,RESTART
os4krnl = OS/4 dbg kernel,LOGSIZE=4096,PRELOAD,CFGEXT=OS4,DBPORT=0,LOADSYM,CTRLC,ALTF2
os4krnlr = OS/4 retail kernel,LOGSIZE=4096,PRELOAD,CFGEXT=OS4,DBPORT=-1,ALTF2
Lars
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