net: axienet: make the 64b addresable DMA depends on 64b archectures
Currently it is not safe to config the IP as 64-bit addressable on 32-bit archectures, which cannot perform a double-word store on its descriptor pointers. The pointer is 64-bit wide if the IP is configured as 64-bit, and the device would process the partially updated pointer on some states if the pointer was updated via two store-words. To prevent such condition, we force a probe fail if we discover that the IP has 64-bit capability but it is not running on a 64-Bit kernel. This is a series of patch (1/2). The next patch must be applied in order to make 64b DMA safe on 64b archectures. Signed-off-by: Andy Chiu <andy.chiu@sifive.com> Reported-by: Max Hsu <max.hsu@sifive.com> Reviewed-by: Greentime Hu <greentime.hu@sifive.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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