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Altera_Forum's avatar
Altera_Forum
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20 years ago

confusions

1. Here is log outport by uclinux

...

0x00200000-0x00d00000 : "romfs/jffs2"

0x00000000-0x00200000 : "loader/kernel"

0x00d00000-0x00e00000 : "User1 configuration"

0x00e00000-0x00f00000 : "User0 configuration"

0x00f00000-0x01000000 : "safe configuration"

...

romfs/jffs2: is it romfs or jiffs2? Or romfs formated by jiffs2 ?

2.

<drivers>/mtd/maps/altera.c 

  .name =  "safe configuration",
  .size =  0x200000,
  .offset =    0x600000,
  .mask_flags =    MTD_WRITEABLE,  /* force read-only */

why mtd_writeable but /* force read-only */ ?

Hehe, I am newbie so the problems confused me.

1 Reply

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

    Hi mountain8848,

    > romfs/jffs2: is it romfs or jiffs2? Or romfs formated by jiffs2 ?

    "romfs/jffs2" is just a name for the partition, nothing more ... it&#39;s there only for human consumption ... so

    the name has absolutely no bearing on what you can or can&#39;t put in the partition. Although, it&#39;s generally a

    good idea for the name to describe the _purpose_ of the partion. The author of the mtd map driver is

    just saying that the partition is _intended_ for use by a "romfs" or "jffs2" filesystem. Perhaps a more

    generic name would be "filesystem". You can take a look at the code in drivers/mtd/maps for examples.

    > why MTD_WRITEABLE but /* force read-only */ ?

    MTD_WRITEABLE is a _mask_, not an enable -- it&#39;s a flag indicating what is to be _removed_. To be

    honest, I never really liked this. Anyway, see:

    include/linux/mtd/partitions.h and include/mtd/mtd-abi.h

    Regards,

    --Scott