Question about Nor Flash Memory Size based on EMIF
Hi all.
I am using DM6446 DVEVM,
I have a question about the NOR flash memory size of DVEVM and the source code of uboot and git kernel tree.
In Uboot Code,
AM29LV256 NOR Flash Memory is just recognized as 16MBytes and Sectors of this flash is not 512's.
Is there any reason to restrict the real size of this Nor flash?
In Kernel Code named board-evm.c
I found this message,
/* NOTE: CFI probe will correctly detect flash part as 32M, but EMIF
* limits addresses to 16M, so using addresses past 16M will wrap */
--> Could please explain me the EMIF limitations of 16MB?
When I modified Nor flash memory size to 32MB( this is real size of AM29LV256),
after command like this,
flash_eraseall /dev/mtd4 ( this mtd4 area is over 16M ..)
this command results OK. but when I rebooted,
The contents of this flash are all cleared.
Could anyone please explain this..
Many Thanks.
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