25 Feb, 2017

1 commit

• f5d45dc91   openrisc: Add optimized memcpy routine ... Browse Code »

  The generic memcpy routine provided in kernel does only byte copies.
  Using word copies we can lower boot time and cycles spend in memcpy
  quite significantly.

  Booting on my de0 nano I see boot times go from 7.2 to 5.6 seconds.
  The avg cycles in memcpy during boot go from 6467 to 1887.

  I tested several algorithms (see code in previous patch mails)

  The implementations I tested and avg cycles:
  - Word Copies + Loop Unrolls + Non Aligned 1882
  - Word Copies + Loop Unrolls 1887
  - Word Copies 2441
  - Byte Copies + Loop Unrolls 6467
  - Byte Copies 7600

  In the end I ended up going with Word Copies + Loop Unrolls as it
  provides best tradeoff between simplicity and boot speedups.

  Signed-off-by: Stafford Horne

  Stafford Horne

  2017-02-25 03:14:36 +0800  

12 Dec, 2016

1 commit

• 266c7fad1   openrisc: Consolidate setup to use memblock instead of bootmem ... Browse Code »

  Clearing out one todo item. Use the memblock boot time memory
  which is the current standard.

  Tested-by: Guenter Roeck
  Acked-by: Jonas
  Signed-off-by: Stafford Horne

  Stafford Horne

  2016-12-12 22:10:00 +0800  

23 Jul, 2011

1 commit

• 616257669   OpenRISC: Miscellaneous ... Browse Code »

  Adds README file, TODO list, and a couple of other pieces that didn't seem
  to fit into any other patch.

  Signed-off-by: Jonas Bonn
  Reviewed-by: Arnd Bergmann

  Jonas Bonn

  2011-07-23 00:46:41 +0800