![]() ![]() In the above in register 0x01, the 0xd0 value is the correct device version and device ID code of the re-timer IC. Read the first 16 registers values of the I2C device at hardware address 0x18 on channel fiveĠ000: 00 d0 00 00 01 0f 00 05 00 00 00 00 00 00 00 00. The 0x0d is channel five: om the mux's data sheet, this sets the B3 enable bit and the B2-B0 channel number. Before attempting to test out the touchscreen, first install the driver as described in. For example, the I2C driver is used to send and receive data from the following devices: PMIC (Power Module) Trusted Platform Module (TPM) Embedded Controller. I just ran these 2 commands in the terminal and my touch screen works. Here address 0x00 was chosen but any value can be used to select the mux's only register, its Control Register. setup IP parameters saving Environment to flash if Ethernet Phy has not been detected during former bootup, reset the board to reload U-Boot : the Ethernet. The inter-integrated circuit communication (I2C) driver is the most-used driver in U-Boot for Chrome OS. In the above example "i2c mw 0x77 0x00 0x0d" selects the mux at I2C address 0x77 and writes 0x0d to the Control Register which in turn selects channel 5. Valid chip addresses: 18 19 1A 1B 66 67 77 CONFIGENVVARSUBOOTCONFIG Define this in order to add. Now probe for devices on the mux's channel five i2c commands at the u-boot command line (as long as you set. Valid chip addresses: 19 1B 1D 36 37 50 51 53 55 57 66 67 68 77įrom the schematics we know that 0x77 is the address of the mux and that the re-timers are connected to channel five of the mux. Now that we've selected the first I2C controller, list what device addresses are there Configuration of U-BOOT options (e.g., CONFIG options) does not appear in the PetaLinux menuconfig system. Select I2C bus 0 which is the LS2088A I2C1 controller See what I2C buses are available (the LS2088A has four I2C controllers) For example, to access the XFI Ethernet re-timer I2C devices on channel 5 of the mux, you need to first set the mux to channel 5. The LS2088A device has four I2C controllers and on the LS2088AQDS development system, the PCA9547 mux is connected to I2C1 at address 0x77. The next commands are kept as alias and for compatibility: editenv env edit. Remember to recompile boot.cmd to boot.scr and note that changes will come into action after second boot. The env commands is used to handle the U-Boot ( Environment Variables) or the UEFI variables. You can do this by adding saveenv command at the end of boot script (boot.cmd). Then, you can select which I2C bus on the multiplexer you want to address. To access the I2C devices on one of the eight channels of the mux you must first set the mux to the needed channel. Parameters regarding video must be saved into U-Boot environment file since they must be read before reading boot script. After inserting your network credentials, save the code. ) our board is able to boot the Liunx kernel.Īs soon as, I try to enable and use the I2C interface in u-boot, the kernel isn't able to boot anymore.Many development systems use the NXP I2C mux to increase the number of devices on a I2C channel. When configuring the basic Hardware (SD Card, UART, Ethernet. Now I have to switch to a the new u-boot build flow created on the sources: (2020.04) as described on: įor our custom board, I adapted the u-boot configuration and device tree blob of the Arria 10 SoC DevKit included in the sources. ![]() With a small adaption, u-boot (2014.10) is able to read a MAC address from an external EEPROM connected through an I2C interface. Until now, I used an old u-boot build flow utilized Quartus and the bsp-editor. The board boots from an SD Card, loading u-boot and than a Linux kernel. valid command in uboot is i2c mw 0x50.0 AA 1 >times of reading. I have an Arria 10 SoC device on our custom board. So you could use ‘mw’ to setup an area of memory with the right contents or even hexedit a file on your host and then load the file to memory, write the memory to EEPROM.
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