The UBoot firmware is what the ESPRESSObin executes on power up, and if the SD card is present and contains a bootable image, starts Ubuntu.
There are situations where U-Boot may need some environment parameter adjustments to support additional hardware. The primary example is when the Ubuntu kernel has been updated to recognize mPCIe SSD cards.
Checking the installed version
Power up the board and press any key to stop the boot process, and present the Marvell>> prompt.
U-Boot 2015.01-armada-17.02.0-gc80c919 (Mar 04 2017 - 15:51:07) aarch64-linux-gnu-gcc (Linaro GCC 5.2-2015.11-2) 5.2.1 20151005 GNU ld (GNU Binutils) 2.25.0 Linaro 2015_10 Marvell>>
The PCIe bus support can be checked. Marvell>>pci init pci_bus_to_hose() failed Marvell>> This error message occurs in version 17.02. The last available pre-built version of UBoot is 17.10.
The binary for ESPRESSObin v4 DDR3 1GB and 2GB boards respectively are
If the PCIe device(s) are supported by U-Boot, the response will be something like
Marvell>> pci init Scanning PCI devices on bus 0 BusDevFun VendorId DeviceId Device Class Sub-Class -------------------------------------------------- 00.00.00 0x1b4b 0x0100 Mass Storage Controller 0x04
Note that VendorId and DeviceId are OEM specific.
Both U-Boot 17.06 and 17.10 install successfully but the pci command returns No such bus. This is why Ubuntu does not recognize any PCIe devices. At present the cause is unknown.
More to be added.
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