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Re: Redboot serial link speed on Arm E7T


On Wednesday 26 March 2003 08:54, Pierre Habraken wrote:
> Jonathan Larmour wrote:
> > > I d'like to use a speed higher than 38400 for uploading programs
> > > from gdb to E7T w/ Redboot.
> >
> > You can set the CYGNUM_HAL_VIRTUAL_VECTOR_CHANNELS_DEFAULT_BAUD
> > configuration option and rebuild redboot. However I don't think the
> > E7T is that speedy so it may not be able to cope with much more.
> > Try it and see!
>
> I tried 57600 and 115200: at 57600, using ckermit, Redboot displays its
> banner and understand incoming commands, however gdb fails to upload
> binaries to the board. At 115200, the board is unable to communicate
> with either ckermit or gdb.
> I don't understand why gdb is able to talk at 57600 to Angel (target
> rdi) but not to Redboot (target remote)...
>

That seems reasonable. GDB works as far as 57600 on a 133Mhz K5x86 while 
RedBoot terminal still works up to 115200. Remember RedBoot (and it's GDB 
stubs) does not use interrupt driven serial IO .

Iztok

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