DOCBoot doesn't compile

Brian O'Dell brian at
Tue Jun 28 17:39:47 EDT 2005

Dan Brown wrote:

> Brian O'Dell wrote:
>> Thank you for the quick response Dan.  DOCBoot does compile now, but 
>> it freezes prior to any indication that it is trying to load the 
>> kernel.  Here is what I get with DEBUG_BUILD defined:
>> Installing DOCBoot.
>> doc_seg = 0xE000           setup_seg = 0x2400
>> int15/e801 returns 0x0F00    initrd_start = 0x0FFF0000
>> top of low mem = 0x0279k    handler seg = 0x9E00
>> -- Press any key --
>> Prior to pressing any key, numlock and capslock respond normally.  I 
>> can also reboot via ctrl-alt-del.  I press enter, then the system 
>> freezes hard.  No numlock or capslock response, ctrl-alt-del does not 
>> work.  Any thoughts or ideas are much appreciated.
> Hmm.  Well, nothing appears odd in the debug messages.  Your DOC is at 
> E000, you have 256Mbytes of RAM, you have 633k free low memory, etc.  
> Let me get some more info from you:
> - what type/size of DOC you're using
> - size of your kernel and initrd
> - what options you use when building DOCBoot (which interrupt, for 
> instance).
> - what other devices are in the system (video, harddrives, etc)
> Hopefully you're able to boot your system normally (DOCBoot install 
> will be skipped if you hold down shift, alt, or control at the 
> appropriate phase of BIOS boot).
>    -Dan

I'm using a 128M DOC2000, model number:  md2202-D128.  It is one of the 
newer INFTL devices.  The kernel is a hefty 1.9 Megabytes.  I would like 
to use initrd in the future, but for now I am leaving it out.  I haven't 
used any options when compiling.  I left doc_bootstub.h alone, except to 
turn on the debugging messages.   DOC_BIOS_HOOK is defined to 0x18.  
Though in my system it behaves more like the description for Int 19h.   
It completely ignores the hard drive on boot even though it is there.  I 
don't care really, just mentioning it in case some BIOS weirdness could 
be causing the trouble.   The BIOS is from General Software.  The 
mainboard is a SBC from Versalogic, VSBC-8.  It has the BX chipset and a 
ATI Rage Mobility video chip.  I have a ultra ata hard drive also.  I 
can boot fine.  The shift bypass works very well.


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