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| 10:54.50 | rsv | which testing i can use for testing file systems |
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| 13:28.43 | wmat | rsv: see here http://elinux.org/Flash_Filesystem_Benchmarks |
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| 20:21.37 | joshc_ | hey all, sorry to those of you who are also in ##kernel...I'm having a problem doing simple programmed IO from the kernel. I'm using ioremap() to map my IO region, and any attempt to access it results in an 'imprecise external abort' |
| 20:22.17 | joshc_ | I've tried using the readl(), __raw_readl(), and ioread32() accessors, to know avail. I'm also able to map via usermode (that is, mmap'ing /dev/mem) |
| 20:22.36 | joshc_ | and I'm able to use u-boot's 'md' command to dump the IO region |
| 20:23.29 | joshc_ | here is my test case: http://pastebin.com/WKZxSyFb |
| 20:23.49 | joshc_ | am I doing something stupid? what are some recommended ways to debug this? |
| 20:28.29 | roxfan | have you looked in other code on this system that's (supposedly) working? |
| 20:30.57 | joshc_ | roxfan: yeah, there are a few platform_drivers that follow very similar codepaths, that is, they use ioremap() and __raw_readl() |
| 20:33.01 | joshc_ | hmm, I suppose, in that way, they are registered to the kernel's memory resource hierarchy |
| 20:33.19 | joshc_ | although, it doesn't seem like the ioremap() codepath cares |
| 20:33.23 | roxfan | i wonder if that memory is already mapped or something like that |
| 20:34.05 | joshc_ | it shouldn't be, but I'm unsure how to validate that |
| 20:35.06 | joshc_ | roxfan: although, then, why would mmap'ing /dev/mem work? |
| 20:38.37 | roxfan | hm, can you check /proc/ioports or /proc/iomem? |
| 20:39.01 | joshc_ | the region isn't listed in /proc/iomem, /proc/ioports is empty |
| 20:39.20 | roxfan | and after ioremap? |
| 20:40.02 | joshc_ | I don't think it shows up, but let me confirm |
| 20:40.18 | joshc_ | this is what I meant by 'not added to the kernels resource hierarchy' |
| 20:40.31 | joshc_ | I'm wondering if my next step should be to make it a legitimate platform_driver |
| 20:42.35 | joshc_ | nope, doesn't show up after ioremap() |
| 20:55.36 | roxfan | hmm i wonder if you need to call request_region() |
| 20:58.04 | roxfan | interesting: http://kerneltrap.org/mailarchive/git-commits-head/2010/1/24/22458 |
| 20:59.33 | joshc_ | very interesting |
| 21:01.09 | joshc_ | I'll give that a try |
| 21:06.04 | joshc_ | nope |
| 21:06.24 | joshc_ | I'm transforming it into a legitimate platform_driver, lets see what happens |
| 21:38.36 | joshc_ | gah, that didn't help either. |
| 21:39.13 | joshc_ | I was hoping someone in here would just tell me I'm doing something stupid :) |
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| 23:36.53 | myopic1 | Out of curiosity, is anyone in here going to SCALE? |