odroid: Update README with USB host usage
Add information wrt using the USB host interface for loading kernel over ethernet and/or usb mass storage. Signed-off-by: Suriyan Ramasami <suriyan.r@gmail.com> Acked-by: Przemyslaw Marczak <p.marczak@samsung.com> Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
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Suriyan Ramasami
Minkyu Kang
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6a23c6533c
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c8322be057
@ -141,3 +141,172 @@ And the boot sequence is:
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- boot_fit - if "Image.itb" exists
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- boot_fit - if "Image.itb" exists
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- boot_zimg - if "zImage" exists
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- boot_zimg - if "zImage" exists
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- boot_uimg - if "uImage" exists
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- boot_uimg - if "uImage" exists
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11. USB host support
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====================
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The ethernet can be accessed after starting the USB subsystem in U-Boot.
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The adapter does not come with a preconfigured MAC address, and hence it needs
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to be set before starting USB.
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setenv usbethaddr 02:DE:AD:BE:EF:FF
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Note that in this example a locally managed MAC address is chosen. Care should
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be taken to make these MAC addresses unique within the same subnet.
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Start the USB subsystem:
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Odroid # setenv usbethaddr 02:DE:AD:BE:EF:FF
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Odroid # usb start
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(Re)start USB...
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USB0: USB EHCI 1.00
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scanning bus 0 for devices... 4 USB Device(s) found
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scanning usb for storage devices... 1 Storage Device(s) found
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scanning usb for ethernet devices... 1 Ethernet Device(s) found
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Odroid #
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Automatic IP assignment:
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------------------------
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If the ethernet is connected to a DHCP server (router maybe with DHCP enabled),
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then the below will automatically assign an ip address through DHCP.
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setenv autoload no
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dhcp
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Odroid # setenv autoload no
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Odroid # dhcp
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Waiting for Ethernet connection... done.
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BOOTP broadcast 1
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DHCP client bound to address 192.168.1.10 (524 ms)
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Odroid #
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Note that this automatically sets the many IP address related variables in
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U-Boot that is obtained from the DHCP server.
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Odroid # printenv ipaddr netmask gatewayip dnsip
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ipaddr=192.168.1.10
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netmask=255.255.255.0
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gatewayip=192.168.1.1
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dnsip=192.168.1.1
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Ping example:
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The ping command can be used a test to check connectivity. In this example,
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192.168.1.27 is a pingable server in the network.
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Odroid # ping 192.168.1.27
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Waiting for Ethernet connection... done.
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Using sms0 device
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host 192.168.1.27 is alive
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Odroid #
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Static IP assignment:
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---------------------
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In the case where there are no DHCP servers in the network, or you want to
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set the IP address statically, it can be done by:
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Odroid # setenv ipaddr 192.168.1.10
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Odroid # ping 192.168.1.27
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Waiting for Ethernet connection... done.
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Using sms0 device
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host 192.168.1.27 is alive
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TFTP booting:
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-------------
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Say there exists a tftp server in the network with address 192.168.1.27 and
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it serves a kernel image (zImage.3.17) and a DTB blob (exynos4412-odroidu3.dtb)
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that needs to be loaded and booted. It can be accomplished as below:
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(Assumes that you have setenv usbethaddr, and have not set autoload to no)
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Odroid # setenv serverip 192.168.1.27
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Odroid # tftpboot 0x40080000 zImage.3.17
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Waiting for Ethernet connection... done.
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Using sms0 device
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TFTP from server 192.168.1.27; our IP address is 192.168.1.10
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Filename 'zImage.3.17'.
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Load address: 0x40080000
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Loading: #################################################################
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#################################################################
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#################################################################
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#######################
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52.7 KiB/s
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done
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Bytes transferred = 3194200 (30bd58 hex)
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Odroid # tftpboot 0x42000000 exynos4412-odroidu3.dtb
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Waiting for Ethernet connection... done.
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Using sms0 device
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TFTP from server 192.168.1.27; our IP address is 192.168.1.10
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Filename 'exynos4412-odroidu3.dtb'.
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Load address: 0x42000000
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Loading: ####
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40 KiB/s
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done
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Bytes transferred = 46935 (b757 hex)
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Odroid # printenv bootargs
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bootargs=Please use defined boot
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Odroid # setenv bootargs console=ttySAC1,115200n8 root=/dev/mmcblk0p2 rootwait
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Odroid # bootz 40080000 - 42000000
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Kernel image @ 0x40080000 [ 0x000000 - 0x30bd58 ]
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## Flattened Device Tree blob at 42000000
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Booting using the fdt blob at 0x42000000
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Loading Device Tree to 4fff1000, end 4ffff756 ... OK
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Starting kernel ...
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[ 0.000000] Booting Linux on physical CPU 0xa00
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... etc ...
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In the above example you can substitute 'dhcp' for 'tftpboot' as well.
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USB Storage booting:
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--------------------
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Similarly we can use the USB storage to load the kernel image/initrd/fdt etc
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and boot. For this example, there is a USB drive plugged in. It has a FAT
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1st partition and an EXT 2nd partition. Using the generic FS (ls/load) makes
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it even easier to work with FAT/EXT file systems.
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For this example the second EXT partition is used for booting and as rootfs.
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The boot files - kernel and the dtb are present in the /boot directory of the
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second partition.
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Odroid # usb start
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(Re)start USB...
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USB0: USB EHCI 1.00
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scanning bus 0 for devices... 4 USB Device(s) found
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scanning usb for storage devices... 1 Storage Device(s) found
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scanning usb for ethernet devices...
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Error: sms0 address not set. <----- Note the error as usbethaddr
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Warning: failed to set MAC address <----- is not set.
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1 Ethernet Device(s) found
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Odroid # usb part 0
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Partition Map for USB device 0 -- Partition Type: DOS
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Part Start Sector Num Sectors UUID Type
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1 3072 263168 000c4046-01 06
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2 266240 13457408 000c4046-02 83
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Odroid # ls usb 0:2 /boot
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<DIR> 4096 .
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<DIR> 4096 ..
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353 boot.scr
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281 boot.txt
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101420 config-3.8.13.23
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2127254 initrd.img-3.8.13.23
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2194825 uInitrd
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2194825 uInitrd-3.8.13.23
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2453112 zImage
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101448 config-3.8.13.26
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2127670 uInitrd-3.8.13.26
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2127606 initrd.img-3.8.13.26
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3194200 zImage.3.17 <--- Kernel
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46935 exynos4412-odroidu3.dtb <--- DTB
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Odroid # load usb 0:2 40080000 /boot/zImage.3.17
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3194200 bytes read in 471 ms (6.5 MiB/s)
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Odroid # load usb 0:2 42000000 /boot/exynos4412-odroidu3.dtb
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46935 bytes read in 233 ms (196.3 KiB/s)
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Odroid # setenv bootargs console=ttySAC1,115200n8 root=/dev/sda2 rootwait
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Odroid # bootz 40080000 - 42000000
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Kernel image @ 0x40080000 [ 0x000000 - 0x30bd58 ]
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## Flattened Device Tree blob at 42000000
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Booting using the fdt blob at 0x42000000
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Loading Device Tree to 4fff1000, end 4ffff756 ... OK
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Starting kernel ...
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[ 0.000000] Booting Linux on physical CPU 0xa00
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Please refer to README.usb for additional information.
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