Messages in this thread | | | Date | Thu, 16 Jan 2003 09:51:43 +0530 (IST) | From | Madhavi <> | Subject | ioremap_nocache() behavior |
| |
Hi
I am testing the Device driver for a PCI network device on linux-2.4.19 and x86 platform.
I have noticed that the system hangs when I do a writel to a PCI MMIO region. I tried ioremap_nocache() instead of ioremap() and the behavior was unpredictable. It hung in a few cases and didn't hang in others. If I did ioremap_nocache() just before calling writel(), writel seems to work fine. I have checked the Base address in PCI configuration space using "lspci -x" command and the driver is getting the correct values.
Any guesses why I am getting this problem? It would be very helpful for me even if you can give a very vague idea.
One more question - How do I unmap the memory remapped using ioremap_nocache()?
Thanks in advance.
Madhavi.
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |