Hello,

-> On my target board I have a spansion GL064M flash device.

-> The flash base address is 0xff000000.

-> I have read the data sheet for the device and noted down the erase and write command sequences for the device.

-> I cannot erase, write to flash by implementing the appropriate command sequences with mw (memory write ) command provided by u-boot that came with my sdk (u-boot 1.1.4).

For example

For erasing sector 0xff000000 I typed the following sector erase command sequence (as per data sheet) at u-boot prompt

mw.b 0xff000555 0xAA mw.b 0xff0002AA 0x55 mw.b 0xff000555 0x80 mw.b 0xff000555 0xAA mw.b 0xff0002AA 0x55 mw.b 0xff000000 0x30

For writing to address 0xff000000 I typed the following write command sequence (as per data sheet) at the u-boot prompt.

mw.b 0xff000555 0xAA mw.b 0xff0002AA 0x55 mw.b 0xff000555 0xA0 mw.b 0xff000000 0x12 ; value 0x12 mw.b 0xff000001 0x34 ; value 0x34 mw.b 0xff000000 0xF0 ; reset (I do it as u-boot driver cfi_flash.c does it )

-> After doing all this , when I do a memory dump using md.b 0xff000000 , to my frustration I see that nothing at all has happend to the flash.

I am sure I am missing something small or may be I am doing a completely wrong thing. I am more of a computer science guy and new to chip programming. Any suggestions, ideas or comments would be very helpful.

Thanks you all

Bilahari

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