On Dec 17, 2010, at 4:46 PM, Mulyadi Santosa wrote: > Hi Daniel :) > > On Sat, Dec 18, 2010 at 04:31, Daniel (Youngwhan) Song > <breadncup@xxxxxxxxx> wrote: >> Hi, there, >> >> I am currently using regular X86 32 bit architecture having PCI and PCIe >> interface in a certain embedded system. >> >> One of PCIe device is attached, and I am trying to load the kernel module. >> >> One problem I have is that a certain area in the iomapped shows only 0xFFFF >> values. So, initially, I thought the hardware device module itself has a >> problem, but when I insert it in PC rather than my embedded system, it shows >> valid values. > > Two things that aren't obvious from your code snippet: > a. Are the base addresses the same for both code ? Or are you using > different one? Have you check the manual to decide in which address > (range) you should map? > > b. How do you know which one is valid and which one is not? > > To me: both looks "good", depending on whether the mapping address is > considered valid or not. > > -- > regards, > > Mulyadi Santosa > Freelance Linux trainer and consultant > > blog: the-hydra.blogspot.com > training: mulyaditraining.blogspot.com Thank you for your interest on it, Mulyadi, and thanks for checking if the post in the mailing list. To answer your question, a. I will check both the base addresses on next Monday since I left already from office. I will compare, and update it. BTW, I checked the base address in PCI configuration and /proc/iomem, so it can be verified that the base address is valid. Also there is only one device on the PCI bus anyway. b. I have the datasheet for the device to check if the values are correct or not. So, I know which value is correct. The invalid value is 0xFFFF. Thanks again, Mulyadi, and have a wonderful day. Daniel -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
