19 Nov
2015
19 Nov
'15
9:05 p.m.
On 19 November 2015 at 06:48, Thomas Chou thomas@wytron.com.tw wrote:
Change map_sysmem() to map_physmem(,,MAP_NOCACHE). Though map_sysmem() can be used to map system memory, it might be wrong to use it for I/O ports. The map_physmem() serves the same purpose to translate physical address to virtual address with the additional flag to take care of cache property. Most drivers use map_physmem() since I/O ports access should be uncached. As ns16550 is a driver, it should use map_physmem() rather than map_sysmem().
Signed-off-by: Thomas Chou thomas@wytron.com.tw
drivers/serial/ns16550.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)
Acked-by: Simon Glass sjg@chromium.org