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Use busybox devmem

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Ciro Santilli
2017-08-08 11:56:01 +01:00
parent 68af3477cc
commit 8d668d6ed3
9 changed files with 35 additions and 144 deletions
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buildroot_config_fragment
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@@ -47,31 +47,6 @@ BR2_PACKAGE_DTC=y
BR2_PACKAGE_DTC_PROGRAMS=y
BR2_PACKAGE_HOST_DTC=y
# On ARM, with our lkmc_platform_device:
#
# devmem2 0x101e9000 w 0x12345678
#
# Then on QEMU monitor, notice that the registers don't actually change value:
#
# xp/4 0x101e9000
#
# Uses /dev/mem.
#
# Upstream: http://free-electrons.com/pub/mirror/devmem2.c
#
# See also:
#
# - https://superuser.com/questions/71389/what-is-dev-mem/1214662#1214662
# - https://unix.stackexchange.com/questions/4948/shell-command-to-read-device-registers
# - man mem
#
# TODO: why with mmap MAP_PRIVATE (used in my previous custom naive version),
# the entire register page is read?;
#
# TODO: have a look at: https://github.com/kaiwan/device-memory-readwrite
#
BR2_PACKAGE_DEVMEM2=y
# Provides setpci and a lspci more advanced than Busybox's
#
# setpci can read and write to PCI configuration registers.