> you have to do it via your bootloader (u-boot) which sets up > the DDR memory controller. > Linux (already) assumes memory is available. > Are you sure linux kernel is changing DDR_SDRAM_CFG ? > When our linux-2.6.28 kernel is up, it's still 0xc3080000 when I read > physical address 0xe0002110.
Hi Norbert, thank you for your fast reply! You are absolutly right! I made a silly mistake. I've read the value of the 0xe0002110 with a 8bit pointer. The value is actually 0xC3100000 which means the 16bit bus width is set. Just to be sure. Is this the only change (in the bootloader) I have to make that all data accesses are 16bit wide? > Btw. We did some performance tests with 16 bit bus-width (DDR2 memory) > and surprisingly performance was almost as good as 32 bit bus-width This is exactly our intention to test. Thanks for that hint. Very good to know! Thank you. Best regards Frank _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev