External RAM filesystem

[Aitor.Viana.Sanchez at esa.int]

Hi, 

OK the problem eventually was only half mine ;). I'll try to explain.

The LEON2 board i got has 64MB of SDRAM memory placed in the address 
0x60000000, and I want to locate the ramdisk filesystem within that area.

The configuration is:

        rtems_bdbuf_config rtems_bdbuf_configuration[] = {
          { 512, numberOfBlocks, (unsigned char *) _SDRAM_FS_ADDR }
        };
        int rtems_bdbuf_configuration_size = 1;

        rtems_ramdisk_config rtems_ramdisk_configuration[] = {
          {512, numberOfBlocks, (void *) _SDRAM_FS_ADDR}
        };

where _SDRAM_FS_ADDR is 0x60000000 and numberOfBlocks is the size of the 
filesystem i want to placed divided by 512 (which is the block size), 
actually:
 
        #define _FILESYSTEM_SIZE                        (0x1000000)     // 
16MB
        static unsigned int numberOfBlocks = (_FILESYSTEM_SIZE / 512);

The problem is that, with this numberOfBlocks  value, RTEMS is not able to 
mount the filesystem, raising an error. The error shows up when 
msdos_format() is called, returning "not such file or directory". On the 
contrary, if numberOfBlocks = 40 (for instance) everything goes well.

Is there any limitation within RTEMS w.r.t. the size of the filesystem?

thanks in advanced.

//avs

-----------------------------
Aitor Viana Sánchez

ESA - European Space Technology Centre (ESTEC)
TEC-EDD - Computer and Data Systems Section
ESA/ESTEC P.O. Box 299 / 2200AG Noordwijk ZH, The Netherlands
Tel (+31) 71 565 6727
Email: aitor.viana.sanchez at esa.int



Thomas Doerfler <Thomas.Doerfler at embedded-brains.de> 
Sent by: rtems-users-bounces at rtems.org
11/15/2007 09:54 PM

To
Aitor.Viana.Sanchez at esa.int
cc
rtems-users at rtems.org
Subject
Re: External RAM filesystem





Hi,

Aitor.Viana.Sanchez at esa.int schrieb:
>
> Hi,
>
> I got everything ready to send an example and to include a wiki entry
> but fist...the example is only working in rtems-4.7.99.2-1.0.3. I also
> tried with RTEMS 4.6.5 but looks like some functions are not implemented
> in this version. This is the compilation output.

ys you are right, I implemented the msdos_format function somewhere
after 4.6.5, so you might have missed it in that version.

See:

http://www.rtems.com/cgi-bin/cvsweb.cgi/rtems/cpukit/libfs/src/dosfs/msdos_format.c


The module should be back-portable if required, but there might be some
other unresolved references then.

Are you currently stuck to 4.6.5 in your work? Which architecture are
you working on?

wkr,
Thomas.

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