From mboxrd@z Thu Jan  1 00:00:00 1970
From: Gary Thomas <gthomas@redhat.com>
To: Weilong Li <weilongli2000@yahoo.com>
Cc: ecos-discuss@sources.redhat.com
Subject: RE: [ECOS] open file error
Date: Sun, 08 Jul 2001 05:27:00 -0000
Message-id: <XFMail.20010708062747.gthomas@redhat.com>
References: <20010708000559.13987.qmail@web14306.mail.yahoo.com>
X-SW-Source: 2001-07/msg00224.html

You can't write to a romfs - it is a
  Read Only Memory File System
  ^^^^ ^^^^

If you want to be able to create files, certainly in Flash,
you'll have to have a different type of file system. 

On 08-Jul-2001 Weilong Li wrote:
> Hi, I folllowed the instruction on nanoxdemo for ipaq
> to install the ROM file system on ipaq. I'm sure it
> is installed correctly, and here is what it is
> look like:
> RedBoot> fis list                                     
>                          Name              FLASH addr 
> Mem addr    Length      Entry point              
> (reserved)        0x50000000  0x50000000  0x00040000 
> 0x00000000                RedBoot           0x50040000
>  0x50040000  0x00040000  0x00000000               
> RedBoot config    0x50F80000  0x50F80000  0x00040000 
> 0x00000000                FIS directory     0x50FC0000
>  0x50FC0000  0x00040000  0x00000000               
> ROM_DISK          0x50F00000  0x50F00000  0x00080000 
> 0x00000000               
> 
> Here is the program I wrote for testing file system.
>#include <pkgconf/system.h>
>#include <pkgconf/kernel.h>
>#include <pkgconf/libc.h>
># include <pkgconf/io_serial.h>
>#include <string.h>
>#include <stdio.h>
>#include <stdlib.h>
>#include <cyg/kernel/kapi.h>            /* All the
> kernel specific stuff */
>#include <cyg/fileio/fileio.h>
>#include <cyg/infra/diag.h>
>#include <sys/time.h>
> 
> int main(void)
> {
>    FILE *fp;
> 
>    printf("Mount ROM file system\n");
>     if (mount("0x50F00000", "/", "romfs") < 0) {
>         printf("... failed\n");
>     }
>   printf("... success.\n");
> 
>   fp = fopen ( "/hellodata", "w+");
>   if (fp != NULL) {
>         // do something
>   }
>   else {
>         perror ("error:");
>       return -1; 
>  }
>   return 0;
> }
> 
> I used gdb to remote run this program in the RAM of
> ipaq, and Here is the result I got:
> 
> (gdb) continue
> Continuing.
> Mount ROM file system
> ... success.
> error:: No such entity
> 
> So, it seems ROM file system is mounted correclty,
> however I cannot use it. Please tell me what is wrong.
> 
> thanks,
> 
> Weilong
> 
> 
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