Hello Karsten,
thank you for your investigations and sorry for the delay : I
have many lives...
here is the test result :
U-Boot 2016.11+dfsg1-4 (Mar 27 2017 - 18:39:51 +0000) Allwinner
Technology
CPU: Allwinner A20 (SUN7I)
Model: Olimex A20-Olinuxino Micro
I2C: ready
DRAM: 1 GiB
MMC: SUNXI SD/MMC: 0, SUNXI SD/MMC: 1
*** Warning - bad CRC, using default environment
Setting up a 1024x768 vga console (overscan 0x0)
In: serial
Out: vga
Err: vga
SCSI: SATA link 0 timeout.
AHCI 0001.0100 32 slots 1 ports 3 Gbps 0x1 impl SATA mode
flags: ncq stag pm led clo only pmp pio slum part ccc apst
Net: eth0: ethernet@01c50000
starting USB...
USB0: USB EHCI 1.00
USB1: USB OHCI 1.0
USB2: USB EHCI 1.00
USB3: USB OHCI 1.0
scanning bus 0 for devices... 1 USB Device(s) found
scanning bus 2 for devices... 1 USB Device(s) found
Hit any key to stop autoboot: 0
=>
=>
=> gpio clear PA17
gpio: pin PA17 (gpio 17) value is 0
=> dhcp
Speed: 100, full duplex
BOOTP broadcast 1
BOOTP broadcast 2
BOOTP broadcast 3
DHCP client bound to address 192.168.11.80 (1028 ms)
*** Warning: no boot file name; using 'C0A80B50.img'
Using ethernet@01c50000 device
TFTP from server 0.0.0.0; our IP address is 192.168.11.80;
sending through gateway 192.168.11.254
Filename 'C0A80B50.img'.
Load address: 0x42000000
Loading: *
TFTP error: 'File not found' (1)
Not retrying...
=>
As you can see, the gpio command make a change ! For information,
the 192.168.11.80 network address and the gateway address are
valid for my home network. The DHCP request did work fine !
Thank you
Regards
Jean-louis