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Adaptation Guide
From Mer Wiki
This page contains information what is expected from a Mer Hardware Adaptation.
After checking the requirements, see step-by-step guide how to move on.
Contents |
Kernel
Required kernel options:
CONFIG_ must be set to one of the permitted values "," seperated and multiple values permitted
- y = set and enabled
- m = set and module
- n = set to no (commented out or not present)
- "value" = set to "value"
- /regexp/ = set to "value" which matches regexp
- ! = Any value not mentioned will be warned, not errored
examples :
- y : means must be set to y
- y,m : means either y or m
- y,n : means module or unset (not module)
- y,m,! : means either y or m but any other value will warn
- "" : means must be set to null, /.+/ means must match something
- "noop","cfs" : means must be either "noop" or "cfs"
| Option | Permitted values | Reason | |
|---|---|---|---|
| CONFIG_EXT4_FS | y,m | Mer uses ext4 as rootfs | |
| CONFIG_DEVTMPFS | y | needed by systemd | |
| CONFIG_DEVTMPFS_MOUNT | y | needed by systemd | |
| CONFIG_CGROUPS | y | ||
| CONFIG_INPUT_EVDEV | y | ||
| CONFIG_AUTOFS4_FS | y,m | ||
| CONFIG_IPV6 | y,m,! | optional, but highly recommended | |
| CONFIG_RTC_DRV_CMOS | y,! | optional, but highly recommended | |
| CONFIG_FANOTIFY | y,! | optional, required for systemd readahead. | |
| CONFIG_UEVENT_HELPER_PATH | "",! | should be empty, if you want to use systemd without initramfs | |
| CONFIG_AUDIT | y,! | optional, but recommended | |
| CONFIG_TMPFS_POSIX_ACL | y,! | recommended, if you want pam_systemd.so to setup your "seats" | |
| CONFIG_ANDROID_PARANOID_NETWORK | n | ||
| CONFIG_ANDROID_LOW_MEMORY_KILLER | n | ||
| CONFIG_DUMMY | n | ||
| CONFIG_ANDROID | n | not tested |
Patches
When compiling kernel for ARM with Mer 0.20110105.1 or newer
You will need to apply this patch to your kernel with this new Mer and toolchain release, if your kernels break on boot (they likely will). It will enable -mno-unaligned-access in your kernel compilation flags.
--- linux-3.1/Makefile 2011-10-24 18:10:05.000000000 +1100
+++ b/Makefile 2011-12-24 16:06:38.848284875 +1100
@@ -640,6 +640,8 @@
KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
endif
+KBUILD_CFLAGS += -mno-unaligned-access
+
# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
# But warn user when we do so
warn-assign = \
When compiling arm kernels < 2.6.36
This patch needs adding to stop systemd journal taking 100% cpu and also other features
This small patch needs applying for proper CGROUPS support
