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| 03:00.17 | MonMotha | ok, so I have an unusual need. I need to communicate with a userspace process via a UNIX domain socket from within the kernel. I gather this is possible with the kernel sockets api (e.g. sock_create and friends as used in e.g. khttpd). Anyone have any pointers or know any gotchas? |
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| 12:10.23 | sdproblem | hi |
| 12:11.39 | sdproblem | I have a problem reading/writing an SD card. someone can help me? I wrote it with a uC, but I think I wrote the first sector (MBR) or the SD card has gone bad.. |
| 12:17.46 | sdproblem | can anyone help me? |
| 12:18.53 | SpeedEvil | The first secot is nothing special. |
| 12:18.57 | SpeedEvil | What do you mean? |
| 12:19.07 | SpeedEvil | At least - it's nothing special as far as the SD is concerned |
| 12:19.50 | sdproblem | in the first sector, 512 bytes, I think there are MBR and partition tables |
| 12:20.17 | sdproblem | now the card is blank. I tried also to write some hexadecimal, after googling the problem |
| 12:20.33 | sdproblem | but both windows explorer and ubuntu cannot "format" the card |
| 12:21.13 | sdproblem | ubuntu sees mt sd card, tries to format (mkfs, etc.) |
| 12:21.28 | sdproblem | mkfs.vfat 3.0.9 (31 Jan 2010) mkfs.vfat: failed whilst writing reserved sector |
| 12:22.33 | sdproblem | and: |
| 12:22.39 | sdproblem | [ 4441.170381] Buffer I/O error on device sdb, logical block 0 [ 4441.170488] ldm_validate_partition_table(): Disk read failed. [ 4441.170524] Dev sdb: unable to read RDB block 0 [ 4441.170577] unable to read partition table [ 4441.172182] sd 4:0:0:0: [sdb] Assuming drive cache: write through [ 4441.173561] sd 4:0:0:0: [sdb] Assuming drive cache: write through [ 4441.173568] sdb: [ 4472.144535] usb 1-1: reset high speed USB device |
| 12:23.09 | SpeedEvil | Do you have another USB reader? |
| 12:23.36 | sdproblem | I try also on windows on my eeePC with sd slot, but nothing to do |
| 12:23.43 | sdproblem | *tried |
| 12:23.48 | SpeedEvil | I'd vote for card gone bad. |
| 12:24.40 | sdproblem | ok. So in the future if I write all zeros in the first sector, you think there won'be problems? |
| 12:25.03 | sdproblem | because I use a SD card for storage with a ARM-Cortex M3 |
| 12:25.05 | SpeedEvil | fdisk should always be able to rewrite |
| 12:25.18 | SpeedEvil | what happens if you do fdisk /dev/sdb |
| 12:25.20 | sdproblem | fdisk cannot access the drive |
| 12:25.24 | SpeedEvil | (assuming that's still the device |
| 12:25.27 | SpeedEvil | ah |
| 12:25.42 | SpeedEvil | In principle as I understand it - SD cards are 'just' block devices. |
| 12:25.55 | SpeedEvil | You can't get at the low level bits and break them in that manner. |
| 12:26.28 | sdproblem | why not? It usually works |
| 12:26.57 | SpeedEvil | What usually works |
| 12:27.16 | SpeedEvil | I mean - you shouldn't be able to write them by writing arbitrary data to them. |
| 12:27.41 | sdproblem | there are 990760 blocks of 512 bytes. If I don't write on the first block (MBR, partition table, etc.), I can write binary infos (byte-per-byte) with the microcontroller and then copy them from my windows program |
| 12:28.05 | SpeedEvil | The first block of the SD isn't very special. |
| 12:28.26 | SpeedEvil | It does not hold any 'magic' information other than the partition table. |
| 12:28.27 | sdproblem | Fianlly I simply copy all the data, and analyze byte-per-byte what I wrote |
| 12:28.51 | SpeedEvil | All of the disk parameters, wear leveling, and hidden stuff is concealed behind a microcontroller running a flash translation layer. |
| 12:29.09 | sdproblem | So, you think that the SD card has gone, instead ofa a problem of writing data on exclusive sectors |
| 12:29.24 | SpeedEvil | This microcontroller translates between the fake 'ideal' block device, and raw data on flash which has errors. |
| 12:29.50 | SpeedEvil | Block '0' on the block interface will not be any particular area of flash. |
| 12:30.00 | SpeedEvil | I'd say it's likely. |
| 12:30.20 | SpeedEvil | SD cards are wirerd, and go bang with poorly specified error modes. |
| 12:30.25 | SpeedEvil | SMART for SD would be lovely. |
| 12:30.58 | sdproblem | but.. what about google? I found some people that write first block with MBR and partition tables.. |
| 12:31.49 | SpeedEvil | It may cause problems with some USB SD readers as I understand it. |
| 12:32.14 | SpeedEvil | But most use the card info to understand the card size, not do it the lazy way and assume the partition table is correct. |
| 12:33.14 | sdproblem | ok |
| 12:33.18 | sdproblem | thank you very much |
| 12:33.53 | SpeedEvil | Abover is as I understand it - I could be confused. Also - it's not completely impossible thatr overvoltaging the SD may kill stuff |
| 12:33.58 | SpeedEvil | In wierd ways |
| 12:34.40 | sdproblem | mmm! |
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| 13:19.10 | sdproblem | I have to go. bye bye e thank you so much |
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| 17:50.17 | alex4nder | hey |
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| 18:53.33 | chouimat | wanders in |
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| 19:50.27 | prpplague | GPSFan: hey, guess who is sitting next to me? cosmic! |
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| 19:57.06 | SpeedEvil | Elvis! |
| 20:02.07 | ZeZu | haha |
| 20:56.10 | GPSFan | prpplague, say hi to cosmic for me... |
| 20:57.37 | prpplague | GPSFan: he said hello |
| 20:57.38 | GPSFan | bets prpplague is sitting in a Qualcomm session :>) |
| 21:27.21 | kergoth | http://i.imgur.com/y7Hm9.jpg?3230 |
| 21:29.29 | orbarron | kergoth: nice.. |
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| 21:43.41 | prpplague | kergoth: nice i need |
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