Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

add:
--CONFIG_NO_HZ_COMMON
--CONFIG_NO_HZ_IDLE
--emulation of floating-point
--VLANs (for management port)
--bridge (for management port)
--scheduler debug and stats

removed:
--IPv6
--wireless
--SCSI
--HID
--parts of USB
--RTC
--ext2
--fat
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

Disable the Bad Block Table (BBT) because the BBT uses the 4 last PEBs of
nand flash, which overwrites UBIFS.
BBT was disabled in the old kernel. There is not so much performance penalty
due to that (see the last sentence in the citation below). There is no impact
on the reliability of a flash because this is just a table of bad blocks which
is otherwise recreated in the ram at every boot.

The MTD layer supplies upper layers (including UBI) with information about bad
PEBs. It keeps so-called bad block table in RAM, which is usually 1 bit per PEB.
When the driver initializes, it has to build this table by scanning whole flash
media, which normally includes reading OOB area of 1st NAND page of each PEB.
This takes time and may be improved by using on-flash BBT (bad block table).
In this case the bad PEB map is stored on flash and MTD does not have to do any
scanning. See the NAND_USE_FLASH_BBT constant in the Linux source codes. But
note, bad PEB scanning is usually minor comparing to the UBI scan time, so
on-flash BBT is not probably going to give much.
(http://www.linux-mtd.infradead.org/faq/ubi.html#L_attach_faster)
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

Since the buildroot anyway downloads .xz archive of the kernel for linux-headers
we can avoid downloading the gz archive for our kernel compilation.
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

Also remove link to at91_softpwm.h
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

By this we drop support of wrs < 3.30. At least its fan.
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

include CROSS_COMPILE
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

On modern switches the fan are driver by a dedicated FPGA core
that does the PWM. This module is not necessary anymore and not even
the kernel patches to make this module work.
Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

The configuration was installing the kernel headers from version 4.4
but we were using 2.6.39 and now we are using 3.16.37. Fix this
by configuring the 3.16.37 as Linux versin to use to get headers
Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

Signed-off-by: Federico Vaga <federico.vaga@gmail.com>

Signed-off-by: Federico Vaga <federico.vaga@gmail.com>

It happens that headers have different sources: buildroot and our own kernel.
For the standard path we have headers from buildroot which include also
some kernel header. For the kernel, we have direct access to those headers.

this means that we mya have conflict in our user-space programs. This patch
does not solve the problem but it just reduce its effects.
Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

The Linux kernel 3.16.37 does not export, or does not have, anymore some
hardware headers. Here I copy all the values we need.

The real fix should be to create a set of WRS headers with all the symbols
we need so that we do not depend anymore on other projects.
Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

The USB gadget framework has changed from Linux v2.6.39. As far as I
understood it's now more modular, so it's not anymore enough to load
just the g_serial.ko driver. Now we have to load also it's
dependencies.

I'm not an expert about USB gadget, this patch is the result of my
understanding in debugging the loading failure of the g_serial.ko
module. Perhaps it will be necessary some adjustments to make it
work the way we want. But for the time begin I will leave it like
this until is clear what we have to adjust.

Note that these dependecies depends also on the configfs file-system.
I had problems to get this work because apparently by using a different
corss-compiler some symbols where removed from the kernel, so our
modules were not able to load because of "undefined symbols".
Using the toolchain compiled within this project solved this issue.
Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

The aim of this module is to register all the FPGA devices
Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

Actually, this is not what I want. I would like to just use an IRQ
resource with the correct IRQ number. What I want is to hide the IRQ
domain knowledge elsewhere. For instance, in the wrs_device module
that register all our devices. But, since I have to update the kernel
with the least number of changes I will leave this for the future.
Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

Copy the vic IRQ controller from the coht-vic repository.
The maintainer prefers to have a copy instead of a submodule.
Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

Many mach headers has been moved out of scope. Of course they are still
accessible by in an ugly way. Here I'm following the ugly way in order
to get something working.

What to do with this headers, perhaps, needs a discussion. I personally
think that we need our local headers with hardware definitions. The
reason is that we saw that in future kernel version some of these
headers complitely disappear. The hardware definitions never change so
we can safely copy them and remove a dependency with an external project.
Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

Instead of using clocksource_register() we use
clocksource_register_hz() as suggested

From kernel patch c7f798e3722610d486e951f04bbc00b6ba124d62
    clocksource: Get rid of clocksource_calc_mult_shift()

    No one is using this, so encourage the use of
    clocksource_register_hz/khz(), and drop this helper.

    Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Yong Zhang <yong.zhang0@gmail.com>
    [jstultz: tweaked commit message]
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

The version 3.16.37 is going to be supporter until 2020
Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

Our software runs only on a single kind of CPU, so we don't need to calculate
it at every boot. The way how daemons are spawned at boot changed
since the function shw_udelay_init was written. Before daemons were spawned one
after another, now they are spawned at the same time and compete during
initialization phase for the CPU.
The loop calculating loops_per_msec was interrupted by few context switches.
When using the kernel 2.6.39, the problem was not visible and usually
loops_per_msec was estimated correctly.
However, introduction new kernel 3.16 lowered probability of getting
correct results. Probably due to the different behaviour of the scheduler.
Bug was found because HAL was not able to detect SFP with
vn=ZyXEL
pn=SFP-BX1310-10-D
vs=S131151000226
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

Explicitly define which version of buildroot should be used.

It solves problem when there is more than one directory matching build/buildroot-2*
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

The variable is unused because there is no need to use it. The color is
white by default; indeed, this variable was set to "WHITE" everytime, but
then not used.
Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

Today it is not really important to do this because all our modules are
within the project itself. But, at somepoint, we may use submodules
in order to integrate drivers from external sources; so, we need to export
our default values because we will not have control over the other projects
Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

We want '/dev/shm' to be empty at boot time. It may happen that
while working with rootfs over NFS this directory is not empty.

With this patch we remove all files from this directory because
they should not be there at all.

What if I put something there on purpose? When using tmpfs,
files in '/dev/shm' will be automatically removed on shutdown.
We are keeping the same behavior. Put your own development files
in '/dev/shm' after the execution of this script by copying them
from another location.

Again, if we use rootfs over NFS and if tmpfs does not work then
the system will use the NFS and the system should continue to work.
In this case the performances will be much worst
Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

This way, next time we want to update the kernel we have just to change
the version without touching too much the code
Signed-off-by: Federico Vaga <federico.vaga@cern.ch>