[U-Boot] Question about ARM compiler optimization problem

[Choe, Hyun-ho]

Hello, everyone.

Currently, I'm working on ARM922T-based board.(In fact, U-Boot is
already ported on that board, Kendin/Micrel KS8695P.)

While, modifying configuration to fit on my new board, I found
that /drivers/mtd/cfi_flash.c is not properly working when -Os
optimization flag is applied.

In function flash_toggle(), following code always gets same result.

		retval = flash_read??(addr) != flash_read??(addr);

When I re-compiled this code with -O0 option, it works well.
even -O1 or -O2 is not helpful.

I think that is not so clean way to be done, is there any way to
overcome this behaviour?

Following is my test environment.

gcc : 3.4.4 / 4.2.1 arm-linux toolchain
	- used for uClinux, distributed by http://www.snapgear.org/

Processor : ARM922T Micrel KS8695P

NOR Flash : STMicro M29W640FT (64Mbit 16bit buswidth)


Regards,

Choe, Hyun-ho