Thank you ED for your reply. Actually I'm in the prototyping phase. so actually I'm just thinking about how much ram I will need and for cost optimization I need to think off which part I can safely remove. There's no hurry for that. After writing to the ML I found that in the register ESDCTL that there's an option for setting the 16 bit. I see that the register is used in this file: http://git.freescale.com/git/cgit.cgi/imx/uboot-imx.git/tree/board/freescale/mx53_loco/flash_header.S?h=imx_v2009.08
so ideally if I set: REG_LD_AND_STR_OP(31, 0x000, 0xc3190000) to REG_LD_AND_STR_OP(31, 0x000, 0xc3180000) I should be able to set the micro DDR interface to 16 bit mode. Only if you remember that. Looks this one a solution like the one you did? Thank you Andrea Il giorno ven, 27/03/2015 alle 14.06 +0100, Ed Sutter ha scritto: > Andrea, > A while back the first spin of our iMX6 based board had a bug that > messed up the upper > 16 bits or our 32-bit DRAM interface. I was able to temporarily run > this as a single bank > in 16 bit mode. This was not with yocto however. I would have to dig a > bit to recall what I > had to change (I don't think it was the file you're pointing to); let me > know if you > need that. > Ed > > Hello everybody, > > > > I would like to know what is the minimum requirement of ram that I need > > to put on the board. > > I saw for example that I can use MT41K128M16JT-125 XIT from Micron. > > it looks like it is a 16 bit ram. > > I know that for a project the ram usage is really low. It is a 16bit > > ddr3. I didn't understand if I can use only 1 ram bank or if I need to > > use (at least 2). On IMX53qsb there's 4 banks but reading: > > http://git.freescale.com/git/cgit.cgi/imx/uboot-imx.git/tree/include/configs/mx53_loco.h?h=imx_v2009.08 > > it looks like that I can define CONFIG_NR_DRAM_BANKS to 1. 1 bank of > > 32bit? or I can use 1 bank of 16bit? > > > > Thank you for the reading > > Andrea > > > -- > Ed Sutter > Alcatel-Lucent Technologies -- Bell Laboratories > Phone: 908-582-2351 > Email: [email protected] > -- _______________________________________________ meta-freescale mailing list [email protected] https://lists.yoctoproject.org/listinfo/meta-freescale
