RT-Thread/rt-thread — pull request #77 by weety (2013-04-02 12:45:45+00:00)
Title: Fixed At91sam9260 context switch issue, enable mmu, update SDIO and EMAC drivers

1. fixed at91sam9260 context thread issue, avoid idle thread stack overflow
2. enable at91sam9260 mmu, update SDIO and EMAC drivers
3. add At91SAM9260 SDIO highspeed and SDIO IRQ capability