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 ---
Changes in v2: - Make updates to be of use from a user's perspective Series-changes: 1 - Add USB host notes for the Odroid
doc/README.odroid | 169 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 169 insertions(+)
diff --git a/doc/README.odroid b/doc/README.odroid index 528bb95..25b962b 100644 --- a/doc/README.odroid +++ b/doc/README.odroid @@ -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.