About device tree for AD9364 on ZYNQ7020

Question

Hello, 
 
 I have ADRV9364 and Custom board that has ZYNQ7020 and AD9364. Our custom board works with ADI's No-Os codes without any problem. We would like to run linux on our custom board. So we followed the steps shared on this documentation https://wiki.analog.com/resources/tools-software/linux-build/generic/zynq . When we build kernel for ADRV9364 everything works well. Unfortunatelly, it does not work on our custom board. Becuase GPIOs, UARTs and Ethernet phy is connected to different pins of ZYNQ7020. We have also 16-bit DDR3 instead of 32-bit DDR3. So I believe we have to change the device tree? ADI says instead of creating from scratch, modify the shared one. 
 
 1) How can I modify shared one for my custom board? 
 2) Should I change zynq-7000.dtsi, zynq-adrv9364-z7020.dtsi and zynq-adrv9364-z7020-bob.dts files then compile it or Should I compile devicetree.dts from devicetree.dtb and change that? 
 3) Should I also make changes on u-boot.elf for creating BOOT.bin? or only changing device tree settings are enough? 
 
 Best Regards

mhennerich · Accepted Answer

The most important part is to build a fsbl and BOOT.BIN for your custom board. 
 The fsbl will take care of the DDR memory initialization. In most cases the default uboot will work, however if UART and ethernet is different you may need to modify the devicetree used by u-boot as well. 
 If this is all new to you you can use petalinux and have that create your BOOT.BIN altogether with fsbl and u-boot. 
 You can also go one step further and have petalinux build your kernel and dtb. 
 This will get you to a kernel prompt and ethernet will likely be working too. 
 Once that is done, I would abandon petalinux and merge the zynq-adrv9364-z7020.dtsi and zynq-adrv9364-z7020-bob.dts. 
 BTW zynq-7000.dts is never modified! 
 Hope that helps, 
 Michael)

Partner Forums

Partner Libraries

Products Mentioned

Associated Drivers

About device tree for AD9364 on ZYNQ7020