Re: Writing not working to CPLD/FPGA.

Le 11/11/2022 à 15:27, Steven J. Hill a écrit :

On 11/11/22 02:53, Christophe Leroy wrote:

quoted

First of all, kernel 3.12 is prehistoric. Have you tried with latest
kernel, or at least with one of the long term support releases (see
https://www.kernel.org/category/releases.html) ?

It is what my customer wants. For this project, upgrading the kernel is 
not an option. I am using the IO accessor out_be32() along with a BAT:

That's maybe not an option for your customer, but it is a good option 
for yourself to find out what the problem is. If recent kernel don't 
have the problem, you can then perform a 'git bisect' in order to find 
out which commit fixed the problem. Once that is done, you may backport 
the fixing commit to 3.12 for your customer.

    setbat(6, 0xe50000000, 0xe5000000, 4096*1024, PAGE_KERNEL_NCG);

Have you tried with ioremap() instead of setbat() ?

Also, what other BATs do you have in your setup ? Maybe you have some 
overlapping BATs.

Christophe