Hi York,
On 09/29/2017 12:44 AM, Łukasz Majewski wrote:
Hi York,
This board has soldered DDR chips. To reduce the SPL image size,
use static DDR setting instead of dynamic DDR driver.
I'm just wondering - since your board supports FIT in SPL, maybe it
would be good to have a binary blob with DDR RAM settings embedded into it?
Then you would be able to provide "hardcoded" SDRAM setup via it?
In this way it could be easily replaceable?
Lukasz,
It sounds reasonable but doesn't work for our platforms. The limitation
is the static RAM. In order to load anything, we need to have some
memory. Lacking of memory is the exact reason I have to use static DDR
setting. I have to make room for other drivers in SPL.
I rather thought about:
Creating FIT image with firmware property, in which you will have 1:1
binary image for DDR controller registers (e.g. 256B).
Then you could store this image to non-volatile memory and read it from
SPL (just copy values to registers).
In that way you would be able to switch different configurations for
different memories (DDR2/DDR3/, 1066, 1333 MHz) without the need to
replace u-boot/SPL.
York
--
Best regards,
Lukasz Majewski
--
DENX Software Engineering GmbH, Managing Director: Wolfgang Denk
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