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From: Wolfgang Denk <wd@denx.de>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH V2 3/3] Add support for the LaCie ED Mini V2 board
Date: Mon, 07 Dec 2009 22:56:32 +0100	[thread overview]
Message-ID: <20091207215632.303363F6CC@gemini.denx.de> (raw)
In-Reply-To: <4B1A05A9.4040104@free.fr>

Dear Albert ARIBAUD,

In message <4B1A05A9.4040104@free.fr> you wrote:
>
> > No, this is not correct. get_ram_size() is used always on a single
> > bank of memory only.
> 
> Do you mean calling get_ram_size() four up to times based on the 
> configured number of banks and configured sizes? I then fail to see the 

Yes, exactly.

> added value of get_ram_size() wrt using the configured sizes directly.

The added value is that get_ram_size() will detect (1) a lot of common
error situations and (2) will detect the actual size of the respective
memory banks.

Assume you have a system where differentt types of memory chips can be
fit, or where you can insert memory modules. Then you configure for
the largest possible type, and get_ram_size() will detect what's
really present, so you can adjust the configuration. See the README
for details.

> >> However I realize that this code is actually SoC-specific, not 
> >> board-specific. It could be moved in cpu/arm926ejs/orion5x/dram.c, and 
> >> then orion5x_sdram_{bar,bs} could be made static (or inlined).
> >>
> >> What do you think?
> > 
> > Seems to make sense.
> 
> All right. Does doing that lift the requirement to use get_ram_size()?

I see no reason yet why you would not want to use get_ram_size() - the
memory test feature alone is useful enough, even if you never intend
to use different RAM sizes.

Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
Build a system that even a fool can use and only a fool will want  to
use it.

  reply	other threads:[~2009-12-07 21:56 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-11-14 23:03 [U-Boot] [PATCH V2 0/3] Support for Marvell Orion5x SoC and LaCie ED Mini V2 board Albert Aribaud
2009-11-14 23:03 ` [U-Boot] [PATCH V2 1/3] Initial support for Marvell Orion5x SoC Albert Aribaud
2009-11-14 23:03   ` [U-Boot] [PATCH V2 2/3] Add Orion5x support to 16550 serial device driver Albert Aribaud
2009-11-14 23:03     ` [U-Boot] [PATCH V2 3/3] Add support for the LaCie ED Mini V2 board Albert Aribaud
2009-11-16  9:05       ` Prafulla Wadaskar
2009-11-29 11:22         ` Albert ARIBAUD
2009-11-18 22:21       ` Wolfgang Denk
2009-11-19  7:51         ` Stefan Roese
2009-11-19 12:48           ` Albert ARIBAUD
2009-11-19 13:10             ` Stefan Roese
2009-11-28 22:21         ` Albert ARIBAUD
2009-11-29 12:56         ` Albert ARIBAUD
2009-12-05  0:35           ` Wolfgang Denk
2009-12-05  7:03             ` Albert ARIBAUD
2009-12-07 21:56               ` Wolfgang Denk [this message]
2009-12-11 15:51                 ` Albert ARIBAUD
2009-12-02  8:31         ` [U-Boot] Mixed 8/16 bits NOR FLASH support (was: [PATCH V2 3/3] Add support for the LaCie ED Mini V2 board) Albert ARIBAUD
2009-12-02  9:15           ` Stefan Roese
2009-12-02  9:38             ` Wolfgang Denk
2009-12-02 11:07               ` [U-Boot] Mixed 8/16 bits NOR FLASH support Albert ARIBAUD
2009-12-02 10:57             ` Albert ARIBAUD
2009-11-18 22:17   ` [U-Boot] [PATCH V2 1/3] Initial support for Marvell Orion5x SoC Wolfgang Denk
2009-11-18 22:51     ` Albert ARIBAUD
2009-11-29  8:55     ` Albert ARIBAUD
2009-12-05  0:37       ` Wolfgang Denk
2009-12-23  6:07         ` Prafulla Wadaskar
2009-11-29 10:34     ` Albert ARIBAUD

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