遇到个奇怪的问题，在OAL层通过以下操作寄存器，失败：
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volatile S5PC100_IIC_REG *i2c = NULL;
i2c = (S5PC100_IIC_REG *)OALPAtoVA(S5PC100_BASE_REG_PA_I2C1, FALSE);
i2c->IICCON = 0xA9;
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发现原来是因为没有打开芯片的iic时钟信号
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volatile S5PC100_SYSCON_CLK_REG *syscon = NULL;
syscon = (S5PC100_SYSCON_CLK_REG *)OALPAtoVA(S5PC100_BASE_REG_PA_SYSCON_CLK, FALSE);
// enable iic2 clk
syscon->CLK_GATE_D1_4 |= (0x1<<5);
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