AM29LV065D FLASH read, erase, program?

Bingo. I must have missed the class on partition<->minor device numbering... Based on other threads here and this (http://www.enseirb.fr/~kadionik/embedded/uclinux/mtd/howto_mtd.html)

I was under the distinct impression that partition N mapped directly to minor number N (aka mtdN/mtdblockN). I now see that when MTD says:

0x00700000-0x00800000 : "Flash FS"

mtd: Giving out device 2 to Flash FS

I should access the partition via /dev/mtd4 (rw) and /dev/mtd5 (ro). I&#39;ve spent several days trying to access it as /dev/mtd2 (which refers to my MTD_WRITEABLE-flagged partition# 1).

Now I can open the partition (via /dev/mtd4), but I can&#39;t do much with it:# mkdir /var/flash# mount -t jffs2 /dev/mtdblock4 /var/flash -n

mount: wrong fs type, bad option, bad superblock on /dev/mtdblock4,

or too many mounted file systems

AND# cp jffs2.img /dev/mtd4

MTD_open

MTD_write

Badness in local_bh_enable at /cygdrive/c/altera/kits/nios2/bin/eclipse/plugins/

com.microtronix.nios2linux.kernel_1.4.0/linux-2.6.x/kernel/softirq.c:140

Stack from 00c53e54:<0>

<0> 00166734<0> 0000ffc4<0> 000ec400<0> 00000000<0> 00000000<0> 00369e68...

AND# erase /dev/mtd4

Trying to open /dev/mtd4

MTD_open

Erase Total 1 Units

MTD_ioctl

MTD_ioctl

Performing Flash Erase of length 65536 at offset 0x0MTD_ioctl

(System hangs here...)

Cheers!

Mike

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partition = minor >> 1

partition is read only = minor & 1

partition is read/write = ~(minor & 1)

irrespective of your char mode device inode attributes.

E.g.:

crw------- 1 root root 90, 0 Jan 1 1970 /dev/mtd0

crw------- 1 root root 90, 1 Jan 1 1970 /dev/mtd0_ro

crw------- 1 root root 90, 2 Jan 1 1970 /dev/mtd1

crw------- 1 root root 90, 3 Jan 1 1970 /dev/mtd1_ro

crw------- 1 root root 90, 4 Jan 1 1970 /dev/mtd2

crw------- 1 root root 90, 5 Jan 1 1970 /dev/mtd2_ro

crw------- 1 root root 90, 6 Jan 1 1970 /dev/mtd3

crw------- 1 root root 90, 7 Jan 1 1970 /dev/mtd3_ro

Regards,

--Scott

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