net/cadence_gem: Implement SAR (de)activation
The Specific address registers can be enabled or disabled by software. QEMU was assuming they were always enabled. Implement the disable/enable feature. SARs are disabled by writing to the lower half register. They are re-enabled by then writing the upper half. Reported-by: NDeepika Dhamija <deepika@xilinx.com> Signed-off-by: NPeter Crosthwaite <peter.crosthwaite@xilinx.com> Message-id: 49efd1f7450af8f980b967d3054245bae137866c.1386136219.git.peter.crosthwaite@xilinx.com Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
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