Hello Heiko,
On Wed, Nov 30, 2011 at 8:41 AM, Heiko Schocher hs@denx.de wrote:
Christian Riesch wrote:
On Tue, Nov 29, 2011 at 7:27 PM, Tom Rini tom.rini@gmail.com wrote:
On Fri, Nov 25, 2011 at 5:37 AM, Christian Riesch christian.riesch@omicron.at wrote:
This code adds an SPL for booting from SPI flash on DA850 SoCs.
Signed-off-by: Christian Riesch christian.riesch@omicron.at Cc: Heiko Schocher hs@denx.de Cc: Sandeep Paulraj s-paulraj@ti.com
Parts of this remind me of omap-common/spl.c so I think longer term we need to figure out if we can make everyone live with a few more common SPL files and functions.
I stole some ideas from omap-common/spl.c and yes, there are similarities :-)
Aside, what are the size limitations you're dealing with here? Thanks!
Size limitation of the SPL? I am using the AM1808 which has 128kB internal SRAM, i think it is the same for all DA8xx SoCs.
If we are using the "nor boot method" in "Legacy NOR Boot" mode on the am1808 we must take care, that we can copy only 16kB from NOR to the internal SRAM! (But I think, we don't need to take care of this mode, as we can use when booting from NOR the "direct NOR Boot" mode, where code is exectuted directly from NOR. This mode is used on the enbw_cmc board)
I agree, there is a restriction for the "legacy nor boot method", but if someone can't execute the code directly from NOR with the "direct NOR boot" for some reason, the "AIS NOR boot" method could be used [1], which allows copying larger memory areas to the internal SRAM. So I think there is virtually no restriction from the ROM bootloader.
Regards, Christian