Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
20 years ago

jffs2 init

I have included and compiled JFFS2 but I am having a problem opening files. Processor:NIOSII, CYCLONE II Version : Quartus/eCos 5.1 I have used mkfs.jffs2 and created my image then I...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
20 years ago

> Does anyone know how the system knows the base address of the jffs patition

> and the length of the partition?

I believe it's set by FLASH_BLOCK_OFFSET/_LENGTH. From my ecc file: 

# >#  Start offset from flash base#  This gives the offset from the base of flash which this#  block device corresponds to.# 
cdl_option CYGNUM_IO_FLASH_BLOCK_OFFSET_1 {
   #  Flavor: data
    user_value 0x00000000
   #  value_source user
   #  Default value: 0x00100000
};
#  Length#  This gives the length of the region of flash given over#  to this block device.# 
cdl_option CYGNUM_IO_FLASH_BLOCK_LENGTH_1 {
   #  Flavor: data
    user_value 0x00200000
   #  value_source user
   #  Default value: 0x00100000
};

> Do you call a jffs init function or a flash init function? Do you add a table entry?

No, I just do the same as you:
#ifdef CYGPKG_IO_FILEIO
    if (mount ("/dev/flash1", "/", "jffs2") == 0)
  chdir ("/");# endif

Regards,

--Scott