[U-Boot] [PATCH v2 1/2] odroid: Update README with USB host usage

[Przemyslaw Marczak <p.marczak@samsung.com>]

Hello Suriyan,

On 11/21/2014 02:26 AM, Suriyan Ramasami wrote:
> 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.
>

This is a very complete instruction. Thank you for a great job!

Acked-by: Przemyslaw Marczak <p.marczak@samsung.com>

Best regards,
-- 
Przemyslaw Marczak
Samsung R&D Institute Poland
Samsung Electronics
p.marczak at samsung.com