On Thu, 2007-10-18 at 10:00 -0400, Ben Warren wrote:
Hi Joseph,
Joseph E. Sacco, Ph.D. wrote:
Hi,
I am new to U-Boot. [Yes... I have been reading the documentation, albeit slowly. There is much to learn.]
I need to modify include/flash.h to support Spansion S29JL064H flash memory
http://www.spansion.com/products/S29JL064H.htmlA search through previous postings to this list did not reveal appropriate values for
* Device ID * Internal FLASH identification code[Do I need one or the other or both?]
This chip is CFI compliant. CFI stands for 'Common Flash Interface', and means that software can learn the chip's topology via a standard query method. In short, you shouldn't need to do anything with flash.h, all you need to do is specify in your board's /include/configs/*.h file that your board uses CFI. Lots of other boards use it, so look through the source to figure out the exact syntax.
regards, Ben
=========================================================================== Ben,
Thanks for responding. I will poke through the source to find the corrrect syntax, which is a great way to learn about u-boot. A simple grep for CFI offers up some perspective candidates to explore.
FWIW... I am working on a board with * (1) MPC8270 * (2) 16MB SDRAM [32MB: 4M x 64] * (2) 8 MB flash chips [16MB: 4M x 32] * (1) LXT972A PHY [connected to FCC1]
I "inherited" an implementation of u-boot for this board based upon a pre-release, CVS version of u-boot-1.0.2. This implementation hacked the existing files for the MPC8260ADS board rather than creating a new board type. Some of the generic u-boot files were also hacked to support the specific processor version and flash type.
I am slowly working through each hack in an attempt to understand what was done and why. My goal is to define a new board type and then port the results to u-boot-1.2.0. Creating a new board type within the existing code base was a simple matter of renaming some files and tweaking a few others. Porting the results to u-boot-1.2.0 will be more challenging. The Fun begins...
Be well,
-Joseph