[ECOS] Serial drivers in iq80310.

[Ashwin Kamath <kamath at OmegaBand dot com>]

I am using a slightly older repository (1 month old), but this problem
should remain the same, since I did not see any relevant changes in the
changelog since then.

I use a default configuration for iq80310. At this stage serial drivers
are not enabled in ecos.ecc, so I go ahead and enable it. Then I run
"ecosconfig tree" and make, but the final image does not have the serial
devices in the device tab. Also for this platform the generic serial
driver sources are required at devs/eth/generic/current/src, but the
generic directory does not get created in the build tree. Another
verification point is that the symbols defined in the generic source
file are not present in the library. Is something else required, so that
I can get the serial drivers built with the rest of the libraries?


So, to circumvent the above problem, I used the /dev/ttydiag device. I
use the xmodem method to download an image which uses this device node.
All the program does is write to this device and read from it, with a
few other threads which are idle at this time. (The lowest priority task
writes to the console). Writes are fine, but reads do not respond to
keystrokes on a minicom terminal very well. Out of every 10 or so keys
that I hit, only one gets echoed back. So I disabled the interrupts
around the call to cyg_io_read, after this everything works fine. But it
is not desirable for a low priority console task to disable interrupts
and wait for console input. Is the above behaviour expected when
/dev/ttydiag is used. (I am not using gdb at this time.)

Thanks,
Ashwin.
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