U-Boot

Important This workaround is applicable to the VCK190, VMK180 and VPK120 because they all use the same circuitry for generating the VADJ voltage: an IR38164 buck regulator with the same I2C address (0x1E), connecting to the same port of the same I2C switch (address 0x74, port 0) and connecting to the same I2C pins of the Versal device (PMC MIO46/47). Note that this workaround is NOT applicable to the VEK280 because that board applies a fixed VADJ voltage of 1. [Read More]

In this post we will look at two methods for modifying the U-Boot environment variables. The first method is changing the values stored in flash from the UBoot command prompt. The second method is changing the hard-coded default values in the PetaLinux project. We’ll be assuming a boot from QSPI flash, although the concepts also apply to booting from SD card or other non-voltatile storage devices. The U-Boot environment variables determine exactly how a board is supposed to boot. [Read More]