Valid ranges of tuning parameters for different setting of CR132, PHYs ... /Jiri

Unofficial User Manual for Rev.G Vybrid Tower board. (Skip page 1 if not loading properly - only title there.)

The VYBRID_SAMPLE_CODE from the website includes an DRAM init Script for the DS-5 Debugger. However it seems it doesn't correctly initialize the Vybrid Tower Samsung Memory. I modified some register settings and got this script works now for my Vybrid Tower Kit. Care must be taken when you again initialize clocks etc in your C Project because most of PLLs etc are already setup  in the script. Regards, Hans-Peter

Here is a quick summary at booting u-boot on the  TWR-VF65GS10 Vybrid tower board. This is an adaptation of u-boot on the i.MX6 sabre sd platform in a few commands for Vybrid, now that mainline u-boot has proper support. This assumes you already have a "working" Linux development environment with some ARM cross-compilers at hand (e.g. Debian + Emdebian). Get u-boot sources We will use git to fetch the U-Boot sources:   $ git clone git://git.denx.de/u-boot.git This should create a u-boot directory with all the latest sources. Note that for more stability you might want to checkout a release instead of the latest version; to do so, list the available release tags with e.g. git tag -l 'v2*', and git checkout <the-desired-tag>. Vybrid support in "mainline" u-boot is fairly recent so you will need a tag no older than v2013.07. Compile Assuming your cross compiler is called e.g. arm-linux-gnueabihf-gcc, you can compile by doing:   $ cd u-boot   $ export CROSS_COMPILE=arm-linux-gnueabihf-   $ make vf610twr_config   $ make This should create a number of files, including u-boot.imx. Put on SD U-boot should reside at offset 1024B of your SD card. To put it there, do:   $ dd if=u-boot.imx of=/dev/<your-sd-card> bs=1k seek=1   $ sync Your SD card device is typically something in /dev/sd<X> or /dev/mmcblk<X>. Note that you need write permissions on the SD card for the command to succeed, so you might need to su - as root, or use sudo, or do a chmod a+w as root on the SD card device node to grant permissions to users. Boot! Your SD card is ready for booting. Insert it in the SD card slot of your Vybrid tower board, connect to the USB to UART port with a serial terminal set to 115200 baud, no parity, 8bit data, power up the platform and you should see something like: U-Boot 2013.04-00300-g3d9138e (Jul 09 2013 - 11:57:02) CPU:   Freescale Vybrid VF610 at 396 MHz Reset cause: WDOG Board: vf610twr DRAM:  128 MiB WARNING: Caches not enabled MMC:   FSL_SDHC: 0 In:    serial Out:   serial Err:   serial Net:   Phy not found PHY reset timed out FEC Warning: failed to set MAC address Hit any key to stop autoboot:  0 => Enjoy! See also... u-boot most common mission is to boot the Linux kernel. See this post for details on how to do it (on i.MX6). If you plan to compile u-boot often, you might want to use a C compiler cache; see this post. Running a Script in U-boot u-boot on the i.MX6 sabre sd platform in a few commands