Filesystem mounting/layout

[Matthew J Fletcher]

Hi,

Thanks for your help, i've got quite far now. I am upto calling
rtems_rfs_format on my SRAM device /dev/nvda, i get an error in
rtems_nvdisk_read_block() because the crc returned from
rtems_nvdisk_read_checksum does not match the checksum calculated in
rtems_nvdisk_page_checksum().

The callstack is as shown.

rtems_nvdisk_error() at nvdisk.c:247 0x8118bc3a
rtems_nvdisk_read_block() at nvdisk.c:518 0x8118bdfa
rtems_nvdisk_read() at nvdisk.c:596 0x8118bdfa
rtems_nvdisk_ioctl() at nvdisk.c:720 0x8118bdfa
rtems_bdbuf_execute_transfer_request() at bdbuf.c:1,976 0x8118e922
rtems_bdbuf_read() at bdbuf.c:2,058 0x8118f3fc
rtems_rfs_buffer_bdbuf_request() at rtems-rfs-buffer-bdbuf.c:46
0x811a2b70
rtems_rfs_buffer_handle_request() at rtems-rfs-buffer.c:167 0x81198df2
rtems_rfs_bitmap_load_map() at rtems-rfs-bitmaps.c:156 0x81197daa
rtems_rfs_bitmap_load_map() at rtems-rfs-bitmaps.c:146 0x81197daa
rtems_rfs_bitmap_create_search() at rtems-rfs-bitmaps.c:565 0x811981e0
rtems_rfs_bitmap_open() at rtems-rfs-bitmaps.c:638 0x81198284
rtems_rfs_write_group() at rtems-rfs-format.c:241 0x8118c60e
rtems_rfs_format() at rtems-rfs-format.c:622 0x8118c60e

It looks like there has not been a write yet to place a CRC on the
filesystem, as rtems_nvdisk_write() has never been called.

Do i have to issue an ioctrl() to erase the disk first ? i can see there is
code checking if the crc is 0xffff and memset'ing the block.

- Matthew

On 13 March 2013 07:37, Sebastian Huber
<sebastian.huber at embedded-brains.de>wrote:

> On 03/12/2013 01:00 PM, Matthew J Fletcher wrote:
>
>> As an open question, although NOR flash is random access, would you use
>> the
>> SRAM alike nvdisk block driver or the flashdisk.c NOR/NAND driver ?
>> Flashdisk
>> seems to have more understanding of flash types, need to erase etc, and
>> the
>> libchip\am29lv160.c seems a generic device level NOR driver.
>>
>
> For a NOR flash disk driver you may have a look at the flashdisk01 test:
>
> http://git.rtems.org/rtems/**tree/testsuites/libtests/**flashdisk01/init.c<http://git.rtems.org/rtems/tree/testsuites/libtests/flashdisk01/init.c>
>
>
> --
> Sebastian Huber, embedded brains GmbH
>
> Address : Dornierstr. 4, D-82178 Puchheim, Germany
> Phone   : +49 89 189 47 41-16
> Fax     : +49 89 189 47 41-09
> E-Mail  : sebastian.huber at embedded-**brains.de<sebastian.huber at embedded-brains.de>
> PGP     : Public key available on request.
>
> Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
>



-- 

regards
---
Matthew J Fletcher
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