[U-Boot-Users] U-boot ColdFire development

[Liew Tsi Chung-r5aahp]

Stefan,

	The flash chips are Intel JS28F160 (2MiB), JS28F320 (4MiB) and JS28F640 (8MiB). 

Regards,
TsiChung

-----Original Message-----
From: Stefan Roese [mailto:sr at denx.de] 
Sent: Wednesday, July 04, 2007 1:21 AM
To: u-boot-users at lists.sourceforge.net
Cc: Liew Tsi Chung-r5aahp; Wolfgang Denk; Detlev Zundel
Subject: Re: [U-Boot-Users] U-boot ColdFire development

Hi TsiChung,

On Tuesday 03 July 2007, Liew Tsi Chung-r5aahp wrote:
> The CFG_FLASH_USE_BUFFER_WRITE does not help in this case because the 
> intel flash chip on M5329EVB does not support Buffer Write. (It could 
> be verified by reading the CFI at offset 0x2a)

Which chips is it? Just curious.

> I were doing an experiment days ago by redirected some of the CFI 
> driver functions to board specific flash driver functions. I replaced
> flash_write_cfiword() in write_buff() to write_data(). Program the 
> flash for 1MB. flash_add_byte() is ~5s more than total time in board 
> specific flash driver. Replaced the write_data() flash status check in 
> while loop - while ((*addr & (u16) FLASH_STATUS_DONE) != (u16) 
> FLASH_STATUS_DONE) to while(!flash_isset (info, sec, 0, 
> FLASH_STATUS_DONE)), this will add another ~11s.

Seems there is some need to enhance the CFI driver. Unfortunately we don't have an custodian for this anymore.

> There are some overhead in the CFI flash driver for non Buffer Write.
> Anyway, I am going to use the CFI flash driver from now on.

Thanks. We should keep in mind to address you thoughts about speed improvement later.

Best regards,
Stefan

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