sisfb: limit POST memory test according to PCI resource length
If the POST memory test fails, the driver may access illegal memory areas. Instead of hard coding the maximum size, set it according to the PCI resource length (an additional check is needed in sisfb_post_map_vram() to ensure it's big enough). DRAM sizing will later adjust video_size to the correct value. Signed-off-by: NAaro Koskinen <aaro.koskinen@iki.fi> Cc: Thomas Winischhofer <thomas@winischhofer.net> Signed-off-by: NPaul Mundt <lethal@linux-sh.org>
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