Hi Albert,
On 07/17/2013 06:10 PM, Albert ARIBAUD wrote:
Hi Bo,
On Wed, 17 Jul 2013 17:14:17 +0800, Bo Shen <voice.s...@atmel.com>
wrote:
As both the DDR SDRAM and NAND flash connect to EBI on at91sam9n12
and share the lower 8 bits data line. If use low drive of the data
line, it will cause DDR data access corrupt in lower address, so
change the data line to high drive mode
This will fix the Linux kernel boot issue when use Lower address
Wait--does this mean that there is no separate chip selects for NAND and
DDR on this SoC?
No. The NAND and DDR has there own chip selects.
This is chip specific. If DDR and NAND share data line, if we use low
drive for EBI IO, it will cause DDR low memory address content corrupt.
For example, if the DDR base address is 0x20000000, if we use 0x20008000
as entry address of Linux kernel, then it won't boot up successfully.
So, if we need to use low memory address, we need this to fix.
Amicalement,
Best Regards,
Bo Shen
_______________________________________________
U-Boot mailing list
U-Boot@lists.denx.de
http://lists.denx.de/mailman/listinfo/u-boot
