From: Todd Poynor <tpoynor@mvista.com>
To: Sreecharan Sivadevuni <mailsreecharan@yahoo.co.uk>
Cc: linux-mtd@lists.infradead.org
Subject: Re: Question regarding mounting CRAMFS and JFFS2 from a single flash chip on ucLinux
Date: Tue, 22 Nov 2005 14:12:08 -0800 [thread overview]
Message-ID: <438397B8.5060205@mvista.com> (raw)
In-Reply-To: <20051122151042.57202.qmail@web26306.mail.ukl.yahoo.com>
Sreecharan Sivadevuni wrote:
> I am using an arm processor based development board on
> which there is an Intel E28F320(NOR) flash chip which
> is of 4MB. ...
> my flash is getting detected on 'cfi_probe'. But when
> I am trying to mount JFFS2(or trying to write to )
> '/dev/mtdblock0'(at 0x00600000) I am getting an error
> that it is a readonly file system. The error as it is
> printed on console is "-EROFS. Is the Sector Locked ?"
> This is coming from file 'cfi_cmdset_0001.c' from
> function 'do_erase_one_block'. This is despite that I
> have made my JFFS2 partition as MTD_WRITEB_WRITEABLE
> in 'physmem.c' file.
Your flash chips probably power up with all blocks locked, and blocks to
be written must be unlocked first. Can use flash_unlock /dev/mtdX prior
to mounting the writeable fs, or various ways of unlocking blocks at
chip probe or maps setup time have been discussed in the archives.
--
Todd
prev parent reply other threads:[~2005-11-22 22:11 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-22 15:10 Question regarding mounting CRAMFS and JFFS2 from a single flash chip on ucLinux Sreecharan Sivadevuni
2005-11-22 22:12 ` Todd Poynor [this message]
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