Running CE directly from RAM

Hi,
I am trying to download CE image through Serial Port to x86(80486 DX)
board.I am not making use of "CEPC Method" provided by Microsoft.I
have customized my BIOS to receive the CE OS image through serial port
and load it at desired location.
I could download the image onto Target platform(In real mode), but
systems hangs up,when i am trying to run this image.Before making FAR
JMP i am switching processor mode to Protected mode.What could be the
problem?
I have created the image using PB 2.12.How can i customize CE in PB so
that it can be run directly from RAM? Is there any special care i need
to take before compiling the OS image?
Thanking you all in advance,
Hemant

hemant
Tue Sep 09 05:43:31 CDT 2003

around 540 KB. I could able to place this image in RAM in real mode.
Yes, As you said i should change the values RAM addresses in
config.bib file and check. Yes i could able to switch to protected
mode without any problems. Only thing i should make FAR JMP to the
entry point of OS image. Thanks for your advice. I will revert back if
any problem. Thank you once again.

Hemant

jeffgla@online.microsoft.com ("Jeff Glaum [MS]") wrote in message news:<6EoVnlmdDHA.2116@cpmsftngxa06.phx.gbl>...
> How big is your OS image? You're able to place the entire image in RAM in
> real mode?
>
> The only hard requirement is that the CPU be in protected mode when calling
> the OS entrypoint. Not sure what you mean about customizing the image to
> run from RAM - I presume you've already done that for the image that's
> failing to run. You select the RAM addresses to be used for the image in
> config.bib. It's hard to saw where it's hanging and why w/o having debug
> access. Presumably you've confirmed that the switch to protected mode is
> successful. Can you verify (using serial output, a port 80 board,
> whatever) that you've made it to the OAL StartUp routine?
>
> Jeff