Olimex A20-OLinuXino-Lime2

The A20 Olinuxino LIME2 is an OSHW board produced by Olimex. The A20-OLinuXino-LIME2 is an upgrade of the Olimex A20-OLinuXino-Lime, but it comes with 1GiB RAM and gigabit ethernet.

= Identification =

The board is marked as A20-OLinuXino-Lime on both the top and bottom of the PCB.

Note that it is not marked as Lime2. The Lime2 variant can be distinguished by the presence of two dram chips on the top of the board between the SoC and the USB connectors, also the ethernet phy is on the bottom of the board instead of the top.

= Sunxi support =

Current status

 * Mainline kernel patches posted to linux-arm-kernel mailing list 2014-09-28
 * Mainline u-boot patches posted to u-boot mailing list 2014-09-28

Manual build

 * For building u-boot, use the A20-OLinuXino_Lime2 target. _FEL version is also available for USB booting.
 * The .fex file can be found in sunxi-boards as a20/a20-olinuxino_lime2.fex (please note that this fex file adopted DRAM clock setting from the Lime2's predecessor -- only dram_tpr4 differs for unknown reasons. Using this fex file the DRAM is clocked with just 384 MHz which costs some few percent performance depending on the application used)

Everything else is the same as the manual build howto.

Mainline U-Boot
For building mainline u-boot, use the A20-OLinuXino-Lime2_defconfig target (once patches are accepted).

Mainline kernel
Use the sun7i-a20-olinuxino-lime2.dtb device-tree file for the mainline kernel.

= Tips, Tricks, Caveats =

FEL mode
The Recovery button (under sata connector, nearest hdmi connector) triggers FEL mode.



Expansion ports
The internal GPIO headers appear to be mirrored compared to the original Lime boards. Due to this there are specific A20-OLinuXino-Lime2-UEXT adapters, however as of 2014-09-28 these do not appear to be available directly from the Olimex shop.

SATA power connector
Unlike other sunxi boards the Olimex boards don't use the JST XH 0.1"/2.5mm header for SATA power but the smaller JST PHR-2 header normally used for connecting LiPo batteries.

= Adding a serial port =



There is a clearly marked UART0 connector on the edge of the board beside the ethernet connector. All you have to do is attach some leads according to our UART howto.

= Pictures =

= See also =


 * Olimex A10-OLinuXino-Lime
 * Olimex A20-OLinuXino-Lime
 * Lime2 schematics & CAD files

Manufacturer images
Olimex images for Lime2