[U-Boot-Users] Why the contents in SDRAM stay?
young726 at hotmail.com
Wed Jul 14 02:54:11 CEST 2004
I am playing with the u-boot that is just installed on my customed board
with PPC405GP (based on walnut). The SDRAM I am using is SAMSUNG
One interesting thing I found is, I used mm to change the first 4 bytes at
address 0, which is suppose to belong to SDRAM, to 0xdeaddead. Then I turned
off the power. After I turned on the power, I used md to check the memory.
The content at address 0 was still 0xdeaddead. I changed the value several
times and found once I modified the SDRAM, the content stays regardless the
power is off. This is very weird. Should the content be lost once the power
is off? Can anybody explain how it happened?
BTW, after I turn off the board I waited for long enough (1-2 minutes) to
turn it on.
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