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90df0f3e24
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>
37 lines
855 B
Makefile
37 lines
855 B
Makefile
#
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# This is free software, licensed under the GNU General Public License v2.
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# See /LICENSE for more information.
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#
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include $(TOPDIR)/rules.mk
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PKG_NAME:=io
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PKG_RELEASE:=2
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include $(INCLUDE_DIR)/package.mk
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PKG_MAINTAINER:=Hauke Mehrtens <hauke@hauke-m.de>
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define Package/io
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SECTION:=utils
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CATEGORY:=Utilities
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TITLE:=Raw memory i/o utility
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URL:=http://www.sleepie.demon.co.uk/linuxvme/io.c
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endef
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define Package/io/description
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This tool can be used to access physical memory addresses from userspace.
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It can be useful to access hardware for which no device driver exists!
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endef
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define Build/Compile
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$(TARGET_CC) $(TARGET_CFLAGS) -Wall $(PKG_BUILD_DIR)/io.c -o $(PKG_BUILD_DIR)/$(PKG_NAME)
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endef
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define Package/io/install
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$(INSTALL_DIR) $(1)/usr/bin
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$(INSTALL_BIN) $(PKG_BUILD_DIR)/io $(1)/usr/bin/
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endef
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$(eval $(call BuildPackage,io))
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