How to set DDR data bus width to 16Bit

Hi all, Does anyone knows how to set the DDR data bus width to 16Bit in linux? I've found that option in U-Boot in the MPC8313ERDB_config file. (verfied with a memory dump of the CPU register (DDR_SDRAM_CFG) - the 16Bit DBW is set(10b) ). But after starting linux the value is set to 00b

Re: How to set DDR data bus width to 16Bit

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 0xc308 when I read physical address 0xe0002110. Btw. We

AW: How to set DDR data bus width to 16Bit

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 0xc308 when I read physical address 0xe0002110. Hi

Re: AW: How to set DDR data bus width to 16Bit

Hi Frank, Yes, it's 0xC310 for 16 bit. I showed the 32bit value. Yes, to go to 16 bit bus-width (1 DDR(2) device), this is the only change needed in u-boot, assuming you have 2 DDR(2) devices (like 8313E-RDB) which together provide 16+16 = 32bit bus-width. Since, surprisingly, the 16 bit