RTL_SPI_SFCSR
value = readl(REG(RTL_SPI_SFCSR));
writel(value, REG(RTL_SPI_SFCSR));
value = readl(REG(RTL_SPI_SFCSR));
writel(value, REG(RTL_SPI_SFCSR));
value = readl(REG(RTL_SPI_SFCSR));
writel(value, REG(RTL_SPI_SFCSR));
while (!(readl(REG(RTL_SPI_SFCSR)) & RTL_SPI_SFCSR_RDY))