[ECOS] RedBoot on V850 problem

Jonathan Larmour jlarmour@redhat.com
Mon Feb 4 02:25:00 GMT 2002

savin@torina.fe.uni-lj.si wrote:
> Hi all!
> I have adopted the eCos CEB port to work with
> NEC StartWARE-V850/SA1 (20MHz) board. GDB stub is
> in flash and downloading / debugging works fine.
> Now I'am trying to get RedBoot running...

No one has ported redboot (yet).

> I download it with gdb and then use minicom, I can
> see the prompt and type in commands. The problem
> arises when downloading a program - if I just
> type the command 'load -m xm' and watch it gives
> me the 'C' char every 10-15 seconds (isn't this to slow?).

> Then I implemented the HAL_DELAY_US function using the
> code from hal/common/current/src/hal_if.c and adding the
> interval timer initialization.

Using that code? Better to use something similar to that found in other
target HALs. The one in hal_if.c is a fallback used if nothing else can be
found, which is why it gets it wrong.
> NOTE: there seems to be a problem with the current implementation
>       of delay_us in hal/common/current/src/hal_if.c -
>       if we have a long delay (usecs=250000) and the
>       CYGNUM_KERNEL_COUNTERS_RTC_PERIOD is a big number (in
>       my case it is 50000), then the following line gives us
>       an integer overflow (usecs and usec_ticks being of type cyg_int32)
>       usec_ticks = usecs*CYGNUM_KERNEL_COUNTERS_RTC_PERIOD;

Firstly that's only in a kernel config (not relevant for RedBoot).
Secondly, delay_us is only intended for short delays.

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