I am study the VPFE driver for the davinci board,now i have some questions
about the VPFE:1. some V4L2 driver will do the poll file opration, but in
/driver/media/video/davinci_vpfe.c ,i can not found the "poll",but in the
davinci demo application it using "select", why? 2. davinci vpfe driver using
"__get_free_pages" to get some buffers memory, but why in mmap, using the
"io_remap_pfn_range" or not "nopage" to map to user space? in the <linux
device driver 3nd> book page 444, it said:Therefore, remap_pfn_range won’t
allow you to remap conventional addresses,
which include the ones you obtain by calling get_free_page. Thank you!
ZhangTianfei
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