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| author | Hauke Mehrtens <hauke.mehrtens@intel.com> | 2019-07-22 15:03:57 +0200 |
|---|---|---|
| committer | Hauke Mehrtens <hauke.mehrtens@intel.com> | 2019-07-24 13:57:09 +0200 |
| commit | 90df0f3e241dc233c3121dfc5e1be937c6c987bc (patch) | |
| tree | 69d9333e6aa0610f600989b7a239130396ae53d9 /lang/python/python-async-timeout | |
| parent | e7faabcf119a8543e0633e47e2da7300d0116a43 (diff) | |
io: Open /dev/mem with O_SYNC for uncached access
Only when /dev/mem is opened with O_SYNC the write and *read* is done
uncached. We saw wrong values read out from the hardware without setting
O_SYNC, the busybox devmem tool showed different values, when O_SYNC is
also set for the io tool, it reads out the same values as devmem.
When looking at the drivers/char/mem.c file in the kernel it is behaving
differently based on the O_DSYNC flag.
Signed-off-by: Hauke Mehrtens <hauke.mehrtens@intel.com>
Diffstat (limited to 'lang/python/python-async-timeout')
0 files changed, 0 insertions, 0 deletions