Re: [Etherboot-developers] I've fixed the problem with net booting dos with PXE to EB to DOS

[<ke...@us...>]

>Hi all,
>  I just fixed the problem where trying to boot dos by chaining from PXE to 
>EtherBoot to dos crashes the system in EtherBoot 5.0.8.  Also, on my system 
>once PXE had loaded EtherBoot, going to local boot to load dos would crash 
>during dos loading as well.
>
>  In version 2.1 of the PXE Specification, in the UNDI_STARTUP service 
>description, it says that 'PXENV_UNDI_STARTUP and PXENV_UNDI_SHUTDOWN are no 
>longer responsible for chaining interrupt 1Ah.  This must be done by the 
>PXENV_START_UNDI and PXENV_STOP_UNDI calls.'  Since loader.S only uses 
>PXENV_UNDI_SHUTDOWN and PXENV_UNLOAD_STACK, the interrupt doesn't get 
>unhooked.  If dos or EtherBoot or any other images load over the PXE 
>interrupt handler, then when int 1Ah gets called, the system will crash.  
>The way I fixed this was to add a call to PXENV_STOP_UNDI.  Other ways to 
>fix this would be to relocate EtherBoot code to other areas or not release 
>the PXE memory to the system.
>
>How should I submit the changes to the code or has this problem already been 
>fixed?
>
>I also rewrote the hex to ascii routines that display the amount of free 
>memory in the PXE loader.  The current routines don't seem to work properly.

That's wonderful, you've finally fixed a long standing bug. If the fixes
aren't too large, say > 10kB, just post them to this developer list so
that Peter and Vasil can give a second opinion. If there are no
corrections, I will issue a patch on the web site, and also queue this
up for 5.0.9 (and also fix it in 5.1.x). And your name gets inscribed in
the change log, naturally.

	Thanks, Ken