@ -141,3 +141,172 @@ And the boot sequence is:
- boot_fit - if "Image.itb" exists
- boot_zimg - if "zImage" exists
- boot_uimg - if "uImage" exists
11. USB host support
====================
The ethernet can be accessed after starting the USB subsystem in U-Boot.
The adapter does not come with a preconfigured MAC address, and hence it needs
to be set before starting USB.
setenv usbethaddr 02:DE:AD:BE:EF:FF
Note that in this example a locally managed MAC address is chosen. Care should
be taken to make these MAC addresses unique within the same subnet.
Start the USB subsystem:
Odroid # setenv usbethaddr 02:DE:AD:BE:EF:FF
Odroid # usb start
(Re)start USB...
USB0: USB EHCI 1.00
scanning bus 0 for devices... 4 USB Device(s) found
scanning usb for storage devices... 1 Storage Device(s) found
scanning usb for ethernet devices... 1 Ethernet Device(s) found
Odroid #
Automatic IP assignment:
------------------------
If the ethernet is connected to a DHCP server (router maybe with DHCP enabled),
then the below will automatically assign an ip address through DHCP.
setenv autoload no
dhcp
Odroid # setenv autoload no
Odroid # dhcp
Waiting for Ethernet connection... done.
BOOTP broadcast 1
DHCP client bound to address 192.168.1.10 (524 ms)
Odroid #
Note that this automatically sets the many IP address related variables in
U-Boot that is obtained from the DHCP server.
Odroid # printenv ipaddr netmask gatewayip dnsip
ipaddr=192.168.1.10
netmask=255.255.255.0
gatewayip=192.168.1.1
dnsip=192.168.1.1
Ping example:
The ping command can be used a test to check connectivity. In this example,
192.168.1.27 is a pingable server in the network.
Odroid # ping 192.168.1.27
Waiting for Ethernet connection... done.
Using sms0 device
host 192.168.1.27 is alive
Odroid #
Static IP assignment:
---------------------
In the case where there are no DHCP servers in the network, or you want to
set the IP address statically, it can be done by:
Odroid # setenv ipaddr 192.168.1.10
Odroid # ping 192.168.1.27
Waiting for Ethernet connection... done.
Using sms0 device
host 192.168.1.27 is alive
TFTP booting:
-------------
Say there exists a tftp server in the network with address 192.168.1.27 and
it serves a kernel image (zImage.3.17) and a DTB blob (exynos4412-odroidu3.dtb)
that needs to be loaded and booted. It can be accomplished as below:
(Assumes that you have setenv usbethaddr, and have not set autoload to no)
Odroid # setenv serverip 192.168.1.27
Odroid # tftpboot 0x40080000 zImage.3.17
Waiting for Ethernet connection... done.
Using sms0 device
TFTP from server 192.168.1.27; our IP address is 192.168.1.10
Filename 'zImage.3.17'.
Load address: 0x40080000
Loading: #################################################################
#################################################################
#################################################################
#######################
52.7 KiB/s
done
Bytes transferred = 3194200 (30bd58 hex)
Odroid # tftpboot 0x42000000 exynos4412-odroidu3.dtb
Waiting for Ethernet connection... done.
Using sms0 device
TFTP from server 192.168.1.27; our IP address is 192.168.1.10
Filename 'exynos4412-odroidu3.dtb'.
Load address: 0x42000000
Loading: ####
40 KiB/s
done
Bytes transferred = 46935 (b757 hex)
Odroid # printenv bootargs
bootargs=Please use defined boot
Odroid # setenv bootargs console=ttySAC1,115200n8 root=/dev/mmcblk0p2 rootwait
Odroid # bootz 40080000 - 42000000
Kernel image @ 0x40080000 [ 0x000000 - 0x30bd58 ]
## Flattened Device Tree blob at 42000000
Booting using the fdt blob at 0x42000000
Loading Device Tree to 4fff1000, end 4ffff756 ... OK
Starting kernel ...
[ 0.000000] Booting Linux on physical CPU 0xa00
... etc ...
In the above example you can substitute 'dhcp' for 'tftpboot' as well.
USB Storage booting:
--------------------
Similarly we can use the USB storage to load the kernel image/initrd/fdt etc
and boot. For this example, there is a USB drive plugged in. It has a FAT
1st partition and an EXT 2nd partition. Using the generic FS (ls/load) makes
it even easier to work with FAT/EXT file systems.
For this example the second EXT partition is used for booting and as rootfs.
The boot files - kernel and the dtb are present in the /boot directory of the
second partition.
Odroid # usb start
(Re)start USB...
USB0: USB EHCI 1.00
scanning bus 0 for devices... 4 USB Device(s) found
scanning usb for storage devices... 1 Storage Device(s) found
scanning usb for ethernet devices...
Error: sms0 address not set. <----- Note the error as usbethaddr
Warning: failed to set MAC address <----- is not set.
1 Ethernet Device(s) found
Odroid # usb part 0
Partition Map for USB device 0 -- Partition Type: DOS
Part Start Sector Num Sectors UUID Type
1 3072 263168 000c4046-01 06
2 266240 13457408 000c4046-02 83
Odroid # ls usb 0:2 /boot
<DIR> 4096 .
<DIR> 4096 ..
353 boot.scr
281 boot.txt
101420 config-3.8.13.23
2127254 initrd.img-3.8.13.23
2194825 uInitrd
2194825 uInitrd-3.8.13.23
2453112 zImage
101448 config-3.8.13.26
2127670 uInitrd-3.8.13.26
2127606 initrd.img-3.8.13.26
3194200 zImage.3.17 <--- Kernel
46935 exynos4412-odroidu3.dtb <--- DTB
Odroid # load usb 0:2 40080000 /boot/zImage.3.17
3194200 bytes read in 471 ms (6.5 MiB/s)
Odroid # load usb 0:2 42000000 /boot/exynos4412-odroidu3.dtb
46935 bytes read in 233 ms (196.3 KiB/s)
Odroid # setenv bootargs console=ttySAC1,115200n8 root=/dev/sda2 rootwait
Odroid # bootz 40080000 - 42000000
Kernel image @ 0x40080000 [ 0x000000 - 0x30bd58 ]
## Flattened Device Tree blob at 42000000
Booting using the fdt blob at 0x42000000
Loading Device Tree to 4fff1000, end 4ffff756 ... OK
Starting kernel ...
[ 0.000000] Booting Linux on physical CPU 0xa00
Please refer to README.usb for additional information.
Suriyan Ramasami
10 years ago
committed by
Minkyu Kang