Syslinux - Jun 2006 - a problem with pxelinux

Hi,

 

 

I am using pxelinux 3.06 to do PXE boot on network.

 

I am using AMI BIOS.

 

My DHCP and TFTP server works fine and pxelinux.0 gets loaded and gets
control.

 

But after int 1Ah, it gets out of the execution saying "No !PXE or PXENV+
API found; we're dead..."    

 

After digging the pxelinux code I found that it quits because of  "jc
no_pxe"  which is after int 1Ah

 

In my int 1Ah code, i.e. in my ISR initially I have pushed all the flags
then provided PXENV+ structure pointer 

and then popped all the flags before returning from the ISR

 

Thus I am not changing any flags.

 

So I want to know that Why "jc no_pxe" statement is used?

If I remove this statement the booting works fine.

 

If I clear the carry flag in my ISR, my keyboard gets hung.

 

 

Thanking you in the anticipation that you will consider my kind request.  

 

Harish

Harish Zunjarrao wrote:
>> 
> In my int 1Ah code, i.e. in my ISR initially I have pushed all the flags
> then provided PXENV+ structure pointer 
> 
> and then popped all the flags before returning from the ISR
> 
> Thus I am not changing any flags.
> 
[...]
> 
> If I clear the carry flag in my ISR, my keyboard gets hung.
> 
You should only change the flags if it's talking to *you*!

You need to clear at least the carry flag (I suggest simply zeroing out 
the bottom byte of the flags word on the stack), but you can only do 
this after you have decoded the invocation and decided that it's 
addressed to you.

	-hpa