From: Sergei Shtylyov <sshtylyov@ru•mvista.com>
To: Wolfgang Grandegger <wg@grandegger•com>
Cc: linuxppc-embedded@ozlabs•org
Subject: Re: Flat device tree definitions for FLASH and MTD partitioning
Date: Wed, 25 Apr 2007 18:34:47 +0400 [thread overview]
Message-ID: <462F6707.80502@ru.mvista.com> (raw)
In-Reply-To: <462F5F86.3060309@grandegger.com>
Hello.
Wolfgang Grandegger wrote:
>>>>>> are there already some thought or even example code on how to
>>>>>> define Flash memory and MTD partitions in the DTS. This would
>>>>>> avoid the ackward MTD partitioning via static structure or boot
>>>>>> line argument and could be done in a generic way.
>>>>> See Documentation/powerpc/booting-without-of.txt and
>>>>> drivers/mtd/physmap_of.c for what's been already done.
>>>> I meant drivers/mtd/maps/physmap_of.c
>>> I had a closer look to this driver. Unfortunately, it can not handle
>>> yet multiple FLASH banks. This could be achieved with an additional
>>> property "bank_count". What do you think?
Please use hyphen, not underscore in property names ("device_type" seems an only exception from this rule).
>> I'm not sure what banks you're talking about -- note that this driver
>> is equivalen in functionality to the plain 'physmap' driver and
>> there's inherited "bank-width" property that handles flash banking.
> Yes, I know. Nevertheless the driver cannot handle flash regions
> composed of more than on FLASH bank because we need to probe every bank.
> Search for "BANK" in drivers/mtd/maps" to understand what I mean.
Hm, from what I could see, those banks are separate maps registered to MTD subsys separately.
What's the point of adding a count property when we simply can define multiple "rom" devices?
> Wolfgang.
MBR, Sergei
next prev parent reply other threads:[~2007-04-25 14:33 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-08 11:37 Flat device tree definitions for FLASH and MTD partitioning Wolfgang Grandegger
2007-04-08 12:11 ` Sergei Shtylyov
2007-04-08 12:21 ` Sergei Shtylyov
2007-04-08 12:41 ` Wolfgang Grandegger
2007-04-25 12:55 ` Wolfgang Grandegger
2007-04-25 13:35 ` Sergei Shtylyov
2007-04-25 14:02 ` Wolfgang Grandegger
2007-04-25 14:34 ` Sergei Shtylyov [this message]
2007-04-25 18:57 ` Wolfgang Grandegger
2007-04-26 8:21 ` Wolfgang Grandegger
2007-04-26 12:36 ` Sergei Shtylyov
2007-04-26 12:59 ` Wolfgang Grandegger
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=462F6707.80502@ru.mvista.com \
--to=sshtylyov@ru$(echo .)mvista.com \
--cc=linuxppc-embedded@ozlabs$(echo .)org \
--cc=wg@grandegger$(echo .)com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox