[U-Boot-Users] CFI flash driver

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Joao Mouro (Ext_NBS)

16 Nov 2005 16 Nov '05

2:08 p.m.

Hi all!

I'm currently working in a new board which supports up to two flash banks. We are using CFI compliant flashes (S29GLXXXN) and I would like to know if it is really necessary to have a board specific driver, or if the cfi_flash.c driver is enough.

Looking at to majority of the boards supported by U-Boot until now, most of them use specific drivers instead of using the cfi_flash (even when the flash is CFI compliant). Is there any particular reason?!

Thanks in advance and best regards, João Mouro

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Wolfgang Denk

16 Nov 16 Nov

3:25 p.m.

In message 852246F66844CC41A5FE1EF659F98F9003164E94@lisi053a.siemens.pt you wrote:

...

Looking at to majority of the boards supported by U-Boot until now, most of them use specific drivers instead of using the cfi_flash (even when the flash is CFI compliant). Is there any particular reason?!

In most cases it's an issue of copy & paste from existing boards, and in some cases it's because of code size.

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Please *stop* posting HTML to this list!

Best regards,

Wolfgang Denk

-- Software Engineering: Embedded and Realtime Systems, Embedded Linux Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de They weren't that important. They were merely at the top. The people who really run organizations are usually found several levels down, where it's still possible to get things done. - Terry Pratchett, _Small Gods_

Kimmo Jukarainen

18 Nov 18 Nov

2:38 a.m.

On Wed, Nov 16, 2005 at 01:08:34PM -0000, Joao Mouro (Ext_NBS) wrote:

...

We are using CFI compliant flashes (S29GLXXXN) and I would like to know if it is really necessary to have a board specific driver, or if the cfi_flash.c driver is enough.

I recently ported U-Boot to a custom board utilizing Spansion S29GLxxxM chip. I used drivers/cfi_flash.c, but at least on this particular board it needed an additional patch. I haven't yet verified if this patch is really needed or if it's just an configuration issue.

I used a patch by Alex Bastos, that is available on u-boot-users list archives, look for this message [1]:

...

From: Alex BASTOS Subject: [U-Boot-Users] [PATCH] drivers/cfi_flash.c support for 8 BIT mode Spansion CFI Flashes Date: Thu, 21 Apr 2005 13:18:53 +0200 Message-ID: <1114082333.42678c1d22672@webmail.televes.com:443>

[1] http://sourceforge.net/mailarchive/message.php?msg_id=11540959

-kimju

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Joao Mouro (Ext_NBS)
Kimmo Jukarainen
Wolfgang Denk