Hi Wolfgang,
On 01/03/2013 09:28 PM, Wolfgang Denk wrote:
The frame buffer is then at the same physical address and I regain 15MB of memory. So solved as far as I am concerned till proven that it really hurts performance.
I can't grok this, though. I could understand if you say you saved up to 2 MB by lifting the 2 MB alignment requirement - but 15 MB? Please elucidate where this number is coming from.
I had the frame buffer at 16mb before the end of the ram to allow u-boot, heap etc to relocated itself into the end of the frame buffer / ram. Without the CONFIG_FB_ADDR, the frame buffer it is located at 1mb before the end and u-boot relocates itself before it. So now linux has 15mb more since the framebuffer is at the 1mb before the end of ram and not 16mb as it used to be.
Regards, Jeroen