* [U-Boot-Users] slow memory running from flash.
@ 2005-11-04 14:16 David Updegraff
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From: David Updegraff @ 2005-11-04 14:16 UTC (permalink / raw)
To: u-boot
Hi.
I have an MPC8343 that runs its memory _VERY_ slowly when I run code
from flash. Identical u-boot code loaded into RAM and run from there is
fine, and 10x or more faster for memcopy and dma_xfer. I.e. the IMMBAR
setup registers for memory are identical. Eg. the 'relocate_code()'
routine takes 5 seconds if i am running from flash, but negligible time
if running from RAM.
The only difference in u-boot code is that when running from ram, the
remap_flash_by_XYZ games in start.S are not played. All dcache issues
are the same either way.
I wonder if anyone has a clue for me about why this might be?
-dbu.
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