On Monday 25 August 2008, Warren Blackwell wrote: > 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 ===================================================================== DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: +49-8142-66989-0 Fax: +49-8142-66989-80 Email: [EMAIL PROTECTED] ===================================================================== _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot