On Thu, Nov 13, 2014 at 03:43:39AM +0100, Stefan Roese wrote:
The functions to detect the state of the ready / busy signal is already available but only used in the SPL case. Lets use it always, also for the main U-Boot. As all boards should have this HW connection.
Testing on Siemens Draco (am335x) showed a small perfomance gain by using this ready pin to detect the NAND chip state. Here the values tested on Draco with Hynix 4GBit NAND:
Without NAND ready pin:
U-Boot# time nand read 80400000 0 400000
NAND read: device 0 offset 0x0, size 0x400000 4194304 bytes read: OK
time: 2.947 seconds, 2947 ticks
With NAND ready pin:
U-Boot# time nand read 80400000 0 400000
NAND read: device 0 offset 0x0, size 0x400000 4194304 bytes read: OK
time: 2.795 seconds, 2795 ticks
So an increase of approx. 5%.
Signed-off-by: Stefan Roese sr@denx.de Cc: Tom Rini trini@ti.com Cc: Scott Wood scottwood@freescale.com Cc: Roger Meier r.meier@siemens.com Cc: Samuel Egli samuel.egli@siemens.com
Applied to u-boot-ti/master, thanks!