--- In Jeremy Freeman <> wrote:
> Doug,
>
> Do you think this issue will manifest itself on the 7800 boards? I and a few
> others have experienced a lot of instability using the 7800 boards when
> serial and SD Card IO are simultaneous.
Hi Jeremy,
I don't know for sure. There are a lot of ifdefs in the SD card driver that do
different stuff depending on whether it's a TS-7800 or a TS-72xx/73xx. I
believe the 7800 has a different DMA driver too. If you're using the UARTS in
the FPGA rather than the ones that the CPU provides it's certainly a
possibility. I didn't notice any weirdness when using the serial ports on the
CPU, only the FPGA one I tried. To know for sure you'd have to try the
"causeSDProblem" script I uploaded to the Files section.
A few notes about the script: I realized when you download it from Yahoo
groups, it adds a .sh extension to the end of it. The script assumes that
there's no .sh extension and that it's in /mnt/root, so you need to delete the
.sh extension from it.
I flush the disk caches in the script a lot. Make sure you have everything
mounted read only. Flushing the disk caches causes any cached writing to be
discarded, so you shouldn't be doing any writing while running the script.
The script defaults to reading from ttts0 at 9600 baud, but doesn't print any
of it to the screen. It should ideally run until you terminate it, which would
mean it's not detecting anything weird happening. But if you run the script and
it exits and prints a message when you start sending serial data to the port it
opened, that would mean that you're affected by this same issue.
Doug
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