My previous comment is still held in moderation, but here's a PS - http://www.rocketboards.org/foswiki/documentation/gsrdreleasenotes
According to this November 21st post on RocketBoards:
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CV SoCFPGA GSRD has been updated to ACDS13.1 code base using ACDS13.1 tools and software release.
AV SoCFPGA GSRD has been created, and it has the same set of software features as CV SoCFPGA GSRD.
This Linux BSP release supports the CycloneV SoC Development Kit, and provides the following for the CycloneV SoC:
Linux kernel v3.9
Drivers: I2C, LCD, EEPROM, RTC, Ethernet, USB (Host), Watchdog, SD/MMC, QSPI, DMA, FPGA Manager, and FPGA Bridges
Boards: Cyclone V DevKit Rev C.
U-Boot 2013.01
Linaro's GCC 4.7 2012.11
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It looks like that is what I need to investigate next!