Re: [Gumstix-users] Duration of Robostix Uploads

[Dave H. <dhy...@gm...>]

Hi Daniel,

On 4/25/07, fo...@it... <fo...@it...> wrote:
> How long does it normally take to transfer a file from the gumstix to the
> robostix?  About 45 minutes ago I reprogrammed the fuses on the robostix,
> next I executed the following command: "uisp --erase --upload
> if=Flash-LED.hex"  However, it is still running.  How long might I expect
> it to continue running?

It normally takes a few seconds. However, when the realtime patch was
delivered (R1239) it broke the high-resolution timing capability. This
resulted in the minimum timer granularity being 10 msec. The uisp
program has lots of places where it delays for 2-5 usec, and these
were being dragged out to be 10 msec.

I actually let uisp download Flash-LED.hex in the slow mode and it
took something like 45minutes to an hour to actually work. Normally it
takes less than 10 seconds.

 I fixed this in R1262 on the robostix side and craig delivered a
patch in 1264 for uisp (so uisp now winds up doing an ioctl call down
to the robostix driver which then calls udelay which isn't affected by
the RT kernel.

So, if your uisp/robostix_drv.ko version is older than R1264, then
that's why you're seeing the problem.

-- 
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/