Hi Prakash
Please quote properly and don't top post. Your emails are very hard to understand.
prakash bedge wrote:
Hi Albert and Stefan,
I have used the proper commands. i.e. mw.b 0xfc000000 0xf0 mw.b 0xfc000055 0x98 md.b 0xfc000010 But still no positive results. Last time I forgot to tell here, that I have commneted the for(;;) loop in "hang" function after flash_init result testing in lib_ppc/board.c and then I am able to run the above commands on uboot prompt.
- You're writing 32-bit words to the chip. At most it should be 16-bit
words, possibly even 8-bits. Try mw.w and mw.b. Prakash - I tried both but no success. How to crosscheck the chipwidth? Can someone tell what is chipwidth and portwidth? I believe I am using chipwidth - 16 and portwidth - 8. How to validate this against chipwidth and portwidth?
Number one thing you *MUST* do is read the flash data sheets, especially the command interface. Repeat until you understand. Then try the QRY command sequence by hand in all the various possibilities (see thread links below).
* In your hardware, the "55" and "AA" addresses may be shifted by one or two bits: http://thread.gmane.org/gmane.comp.boot-loaders.u-boot/31501/focus=31735
* In your hardware, the command byte lane may be one byte wide, two bytes wide, or four bytes wide. This changes the 55/AA addresses and which byte lane(s) are used for the command. * Do you have 1, 2, or 4 chips on your board? * Is your memory bus 1, 2, or 4 bytes wide?
The thread links below will help explain. Note that Robert is using the BDI, and thus using the BDI memory read/write commands. You want to use u-boot's memory read/write commands instead.
Pay special attention to these posts: http://thread.gmane.org/gmane.comp.boot-loaders.u-boot/31501/focus=31588 http://thread.gmane.org/gmane.comp.boot-loaders.u-boot/31501/focus=31723 http://thread.gmane.org/gmane.comp.boot-loaders.u-boot/31501/focus=31724 http://thread.gmane.org/gmane.comp.boot-loaders.u-boot/31501/focus=31730 http://thread.gmane.org/gmane.comp.boot-loaders.u-boot/31501/focus=31735 http://thread.gmane.org/gmane.comp.boot-loaders.u-boot/31501/focus=31787 http://thread.gmane.org/gmane.comp.boot-loaders.u-boot/31501/focus=31738
Good luck, gvb
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