Orangepi PC

This tutorial will show the details of Olimex A20-OLinuXino-LIME2 board mainline support and other details like

hardware, documentation, schematics are available at hardware and linux-sunxi

Hardware Access

BSP Build

Image building need host to ready with all necessary tools ready, refer here

U-Boot

$ git clone git://git.denx.de/u-boot.git
$ cd u-boot
$ make orangepi_pc_defconfig && make

Linux

$ git clone git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
$ cd linux-next
$ make mrproper
$ ARCH=arm sunxi_defconfig && $ ARCH=arm make -j 4 zImage dtbs

Booting

SD Boot

FEL/USB Boot

U-Boot

USB Mass Storage gadget

We can use the board as a USB Mass Storage device:

You will be able to access all the partitions of any block device that is on the board or connected to it,

from your host PC - You will see them as /dev/sdXX, just like connecting a regular USB storage to your PC,

and you’ll be able to mount them, and have full read/write access to them.

We can even use it to flash a new U-Boot, re-partition the storage, re-format it, etc.

This is especially useful for updating the internal eMMC.

To do this you need to connect a USB cable between the OTG/Client port of the board and a regular USB Host port on your PC,

and use U-Boot’s ums command.

Linux

USB Mass Storage gadget

Build otg mass storage as statically linked module with

CONFIG_USB_GADGET_LEGACY=y

CONFIG_USB_MASS_STORAGE=y

Append bootargs with g_mass_storage.removable=1 g_mass_storage.luns=1

[    1.676222] usb_phy_generic usb_phy_generic.0.auto: usb_phy_generic.0.auto supply vcc not found, using dummy regulator
[    1.687279] musb-hdrc musb-hdrc.1.auto: MUSB HDRC host driver
[    1.693023] musb-hdrc musb-hdrc.1.auto: new USB bus registered, assigned bus number 9
[    1.701483] hub 9-0:1.0: USB hub found
[    1.705290] hub 9-0:1.0: 1 port detected
[    1.709841] Mass Storage Function, version: 2009/09/11
[    1.715010] LUN: removable file: (no medium)
[    1.719330] LUN: removable file: (no medium)
[    1.723613] Number of LUNs=1
[    1.726619] g_mass_storage gadget: Mass Storage Gadget, version: 2009/09/11
[    1.733592] g_mass_storage gadget: userspace failed to provide iSerialNumber
[    1.740629] g_mass_storage gadget: g_mass_storage ready
# cat /proc/cmdline
console=ttyS0,115200 earlyprintk root=/dev/mmcblk0p1 rootwait g_mass_storage.removable=1 g_mass_storage.luns=1
# fdisk -l
Disk /dev/mmcblk0: 15 GB, 15931539456 bytes, 31116288 sectors
486192 cylinders, 4 heads, 16 sectors/track
Units: cylinders of 64 * 512 = 32768 bytes

Device       Boot StartCHS    EndCHS        StartLBA     EndLBA    Sectors  Size Id Type
/dev/mmcblk0p1    320,0,1     815,3,16         20480   31116287   31095808 14.8G 83 Linux
# echo /dev/mmcblk0 > /sys/devices/platform/soc/1c19000.usb/musb-hdrc.1.auto/gadget/lun0/file

Access the disk and write and umount