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由 bernard.xiong 提交于
fix the cortex-m3 context switch bug when interrupt preempts pendsv exception; add RT_LWIP_ETH_PAD_SIZE option; fix device activate flag set issue in init function. git-svn-id: https://rt-thread.googlecode.com/svn/trunk@193 bbd45198-f89e-11dd-88c7-29a3b14d5316
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