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io: Open /dev/mem with O_SYNC for uncached access

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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>
(cherry-picked from 90df0f3e24)
This commit is contained in:
Hauke Mehrtens
2019-07-22 15:03:57 +02:00
committed by Hauke Mehrtens
parent 39001de7b0
commit 1f082d84dd
2 changed files with 2 additions and 2 deletions
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utils/io/Makefile
+1 -1
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@@ -6,7 +6,7 @@
include $(TOPDIR)/rules.mk
PKG_NAME:=io
PKG_RELEASE:=1
PKG_RELEASE:=2
include $(INCLUDE_DIR)/package.mk