What would cause direct FPGA I/O to break?

SJHardy · Post by **SJHardy** » Mon Jun 01, 2020 9:07 pm

BigThread7 compiles and loads OK, but when I execute it there is no console print. If I comment out the array definition and change to a different printf, it works.

I could not see any obviously bad addresses in the load.

Attached linker files. I'll download the latest release and try it out.

Regards,
SJH

SJHardy · Post by **SJHardy** » Mon Jun 01, 2020 9:12 pm

PS:
I did notice there are some comments in cload_cinit() which are tagged with 'tktk':

if (temp == 0) // tktk skip 0 length pads

Stepping through with the debugger, I did notice that temp would in fact be zero every other time through the main loop of that function. Not sure how that's supposed to work, but from a naive perspective I would not have expected it to take that branch so often.

Regards,
SJH

SJHardy · Post by **SJHardy** » Mon Jun 01, 2020 9:59 pm

Found this thread re TI:
https://e2e.ti.com/support/tools/ccs/f/81/t/454222

So I added

i = i+7 & ~7; // SJH - align to 8

at the bottom of the loop in cload_cinit() and (lo and behold) it fixes my problem loading the supervisor. So I guess you should try it out on Windows too!

Regards,
SJH

Post by **TomKerekes** » Tue Jun 02, 2020 3:49 pm

SJH,

You're a genius! It works in Windows also and allows your .out file to load and run in V4.33q. Will add to the next release.

Dynomotion Forum

What would cause direct FPGA I/O to break?

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