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>
include $(TOPDIR)/rules.mk
PKG_NAME:=io
-PKG_RELEASE:=1
+PKG_RELEASE:=2
include $(INCLUDE_DIR)/package.mk
printf("Attempting to map 0x%lx bytes at address 0x%08lx\n",
real_len, real_addr);
- mfd = open("/dev/mem", (memfunc == MEM_READ) ? O_RDONLY : O_RDWR);
+ mfd = open("/dev/mem", (memfunc == MEM_READ) ? (O_RDONLY | O_SYNC) : (O_RDWR | O_SYNC));
if (mfd == -1) {
perror("open /dev/mem");
fprintf(stderr, "Is CONFIG_DEVMEM activated?\n");