IRC log for #elinux on 20090916

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07:30.32VitRusHello, Whoever speak to me, please
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07:57.55Ghurrhi every one
07:59.12VitRushi
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07:59.50VitRusGhurr how are you?
08:00.03Ghurrfine thx and you ?
08:01.23VitRusGhurr not bad, not bad thx
08:02.18VitRusGhurr What is the weather like today?
08:02.35Ghurrtoo much cloud ><
08:03.23VitRussimilarly )
08:04.39Ghurrwhere are you from ?
08:13.07VitRusGhurr i'am from Russia
08:13.17VitRusGhurr where are you from ?
08:36.50Ghurrfrance
08:36.59Ghurrsorry I m a little busy :)
08:37.20Ghurrtrying to find a way to use gpio from user space
08:40.53VitRusGeneral Purpose I/O?
08:47.14Ghurryes
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14:00.18wmatGhurr: you've seen gpio.txt?
14:00.32Ghurryes
14:01.20Ghurrin fact I allready use the sysfs interface to read my "input" gpio
14:01.46Ghurrbut each time I try to change the value of an output gpio, the change don't take effect
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16:06.45BabbelaarNAND is a block device and why we use char drivers for reading and writing to it?
16:07.03Babbelaarchar drivers - mtd util drivers??
16:07.42Babbelaarany one please tell me?
16:07.52Babbelaarwhen we mount we mount it as block device
16:08.22Babbelaarbut when we write to the NAND flash, we use char (mtdchar) to do it
16:08.29Babbelaarwhat may be the reason?
16:12.01Babbelaaranybody?
16:12.39gustavozbecause you need IOCTLs
16:12.57gustavozerasing a flash isn't just writing FFs to a block device
16:15.36Babbelaarbut i can use dd if=somefile of=/dev/mtdblockx
16:15.59Babbelaarso whats the need. Its confusing. Sorry if i m naive
16:16.12gustavozgoogle for "mtd ioctl" the first search explains
16:16.20Babbelaarsure
16:16.21gustavozs/search/results/
16:16.24gustavoz*result
16:16.49gustavozbasically erasing a flash block is a command and that's not handled by block devices directly
16:17.08Babbelaarhmm
16:22.51Babbelaargustavoz: flashing an actual filesystem onto your mtdblock devices defeats
16:22.54Babbelaarthe purpose of using a wear levelling filesystem.
16:24.02BabbelaarDoes it mean mtdchar drivers use some wear-leveling algo's to protect the flash ?
16:24.07gustavozBabbelaar: how's that? you need a clean starting point
16:24.49Babbelaar:(
16:25.01Babbelaarok will read more and come back again
16:25.06BabbelaarThank you
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17:02.00Babbelaargustavoz: To write to NAND, we should first erase and then write to it. For that, we are using ioctl (char device).
17:02.09BabbelaarIs that right?
17:02.31BabbelaarWe can still use cat /dev/mtchar0 < file.bin
17:02.47Babbelaarbut on a NOR flash, it wont work properly
17:03.11Babbelaaras in NOR flash, it cant flash properly if u dont do an ERASE
17:03.21BabbelaarIs my understanding right?
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