[Gllug] Virtual memory error in driver
salsaman at xs4all.nl
salsaman at xs4all.nl
Mon Jul 25 21:14:56 UTC 2011
Hi all,
I am trying to write a driver to read the values of some peripheral. The
first step is to set the direction of the pins to read, the code is
something like:
unit8_t *address = 0x01e26088;
memset(address, 0xFF, 1);
however when I load the module with this code, I get an error:
Unable to handle kernel paging request at virtual address 01e26088
Thinking the address may have been remapped, my second attempt was like this:
page *mempage;
void *page_addr;
mempage = virt_to_page(0x01e26000);
page_addr = kmap(mempage);
memset(page_addr + 0x88,0xFF,1);
kunmap(mempage);
but again I got exactly the same error.
Can anybody advise me how to do this correctly ?
TIA,
Salsaman.
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