Thank you Sir. Turns out I had a build config issue and u-boot supports this chip wholly.
I appreciate your response all the same!
-WB
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From: Stefan Roese [mailto:sr@denx.de] Sent: Mon 8/25/2008 9:42 PM To: u-boot@lists.denx.de Cc: Warren Blackwell Subject: Re: [U-Boot] u-boot / MX25L12805D
I appreciate any response to the following query...
I am developing a project which utilizes u-boot. I started from an Atheros source package which contains a modified u-boot for their AP83 reference design. This reference design has an SST flash chip (SST39VF6401 - http://www.sst.com/products.xhtml/parallel_flash/39/x16/SST39VF6401). This all works well.
This is a "normal" parallel NOR FLASH chip with an AMD/Spasion-type command interface.
My OEM partner for the project has developed a Prototype A design, which (in principle) is based on AP83. However, the flash chip is different. This design has an MXIC flash chip (MX25L12805D - http://www.macronix.com/QuickPlace/hq/PageLibrary4825744A00264C7F.nsf/h_ Index/E2C69FC9EFF9292F4825744A0029FE02/?OpenDocument&PartNo=MX25L12805D)
I just downloaded the datasheet. This seems to be a serial FLASH chip. So you need a completely different driver for this chip. And the user interface will be different, since serial chips (SPI) don't support the normal memory commands like "mm/md".
I am able to boot the board with this u-boot; however I can not access the flash chip properly. The chip is not identified or addressed properly.
I don't have any starting source that I can find for this particular flash chip. I have tried modifying the #defines in flash.c to no avail.
I have also tried using various source files (flash.c/h) which I was able to find under our u-boot source tree, as well as 3rd party published source code.
At this stage, I'm under the impression that I need to find (or develop!) the u-boot flash driver files. Developing this is a bit out my league.
I'm afraid, but for this FLASH porting you will need to "develop" some code.
Does anyone know of u-boot source which works for the above mentioned mxic flash chip?
I have no experience with serial NOR FLASH chips, so I can't tell you if this specific chip is supported by the U-Boot SPI FLASH driver.
Best regards, Stefan
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