Re: [ECOS] Problems with RedBoot on x86 generic pc...

[Jonathan Larmour <jlarmour at redhat dot com>]

Adam Agnew wrote:
> 
> I've tried the provided image for a floppy on several x86 boxen, and it
> works on some, doesn't on others. As a test, i tried setting
> 
> cdl_option CYGNUM_HAL_VIRTUAL_VECTOR_COMM_CHANNELS { user_value 1 };
> and
> cdl_option CYGSEM_HAL_I386_PC_DIAG_SCREEN { user_value 0 };
> 
> That certainly cleared up the problem, but of course gets rid of the PC's
> screen, which was nice. Maybe someone can use this info to track down the
> bug, I'm not that familiar with the code base yet. But that's a temporary
> fix for poor folks like me who it wasn't working for. Perhaps this is
> just a problem with motherboards with only one serial port. Perhaps its
> deeper, *shrug*.

One way to find out if there's a problem with boards with one serial
port.... go to hal/i386/pcmb/current/src/pcmb_serial.c and comment out the
stuff for channel 1 in cyg_hal_plf_serial_init.

Then go to pcmb_screen.c and in cyg_hal_plf_screen_init change all the "2"s
to "1"s.

Go to /hal_diag.c and remove the middle entry of pc_ser_channels and change
the 3 to a 2.

Finally go to hal/i386/pc/current/cdl_hal_i386_pc.cdl and change
CYGNUM_HAL_VIRTUAL_VECTOR_COMM_CHANNELS to have:

       default_value   { CYGSEM_HAL_I386_PC_DIAG_SCREEN ? 2 : 1 }

Then build and try a redboot on a PC with one serial port. If it works
where the old image didn't, let us know.

Jifl
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