[U-Boot] [PATCH 1/2] arm: vf610: lpuart: fix status register handling

[Stefano Babic]

On 19/08/2014 17:54, Stefan Agner wrote:
> The status register 1 (S1) is not writeable, hence we should not
> write it. In order to clear the RDRF flag we only need to read
> the data register.
> 
> Also, when stressing U-Boot a lot with serial input, an overflow can
> occur which asserts the S1_OR flag (while not asserting the S1_RDRF
> flag). To clear this flag we again just need to read the data
> register, hence add this flag to the abort conditions for the while
> loop.
> 
> Insert a compiler barrier to make sure reading the data register
> gets executed after reading the status register.
> 
> Signed-off-by: Stefan Agner <stefan at agner.ch>
> ---

Applied to u-boot-imx, thanks!

Best regards,
Stefano Babic



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