On Fri, 16 Oct 2009 13:09:15 -0400 Mark Asselstine mark.asselstine@windriver.com wrote:
The SheevaPlug DevKit is shipped with 4x8 by 1Gb DDR devices in two banks for a total of 512MB of RAM. Based on this configuration the existing values for SDRAM address control register are incorrect
-DATA 0xFFD01410 0x00000099 # DDR Address Control -# bit1-0: 01, Cs0width=x16 -# bit3-2: 10, Cs0size=512Mb -# bit5-4: 01, Cs1width=x16 -# bit7-6: 10, Cs1size=512Mb +DATA 0xFFD01410 0x000000cc # DDR Address Control +# bit1-0: 00, Cs0width=reserved +# bit3-2: 11, Cs0size=1Gb +# bit5-4: 00, Cs1width=reserved +# bit7-6: 11, Cs1size=1Gb
I did the same change for OpenRD before, and bit 1-0 and 5-4 are not really reserved (it's fixed in a later version of the Marvell documentation), so the comments should be
# bit1-0: 00, Cs0width=x8 # bit3-2: 11, Cs0size=1Gb # bit5-4: 00, Cs1width=x8 # bit7-6: 11, Cs1size=1Gb
Nice catch!
// Simon