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Linux Kernel 4.9.y

19,244 bytes added, 10:07, 7 May 2018

Created page with "=Introduction= This article is for specific 2.6.37.y Linux kernel bran..."

=Introduction=
This article is for specific 2.6.37.y Linux kernel branch series. All the steps has been tested with [http://releases.ubuntu.com/12.04/ubuntu-12.04.5-desktop-amd64.iso Ubuntu 12.04 64b] and [http://labs.isee.biz/index.php/How_to_setup_a_cross_compiler#IGEP_OMAP3 IGEP SDK Yocto Toolchain 1.2.2-3].

All configurations support the following IGEP Expansions Boards:

* IGEP v2 EXPANSION (IGEP0022)
* IGEP PARIS / BERLIN (BASE0010)
* IGEP NEW YORK (ILMS0015)

Depending the Kernel configuration used, 2.6.37.y series support the following IGEP OMAP3 Processor Boards:

==igep00x0_defconfig==
* IGEP v2 '''(WIFI/no WIFI)''' (IGEP0020'''RC''')
* IGEP COM MODULE / ELECTRON '''(WIFI/no WIFI)''' (IGEP0030'''RE''')

==igep00x0_wilink8_defconfig==
* IGEP v2 '''(WIFI/no WIFI)''' (IGEP0020'''RF''')
* IGEP COM MODULE / ELECTRON '''(WIFI/no WIFI)''' (IGEP0030'''RG''')

==igep00x0_nowifi_defconfig==
Alternative configuration:

* IGEP v2 '''(no WIFI)'''
* IGEP COM MODULE / ELECTRON '''(no WIFI)'''

=Setup IGEP SDK Yocto Toolchain 1.2.2-3=
==Install==
Download - [http://www.isee.biz/support/downloads/item/igep-sdk-yocto-toolchain-1-2-2-3 isee.biz]

follow the next steps:

* Open a terminal
* Located your downloaded file, in my case is inside /home/jdoe/Downloads:

<pre>jdoe@ubuntu ~ $ cd Downloads/</pre>
* Extract binaries in root directory with root privileges

<pre>jdoe@ubuntu ~/Downloads $ sudo tar jxf igep-sdk-yocto-toolchain-*.tar.bz2 -C /</pre>
* Make sure that binaries are installed correctly.

<pre>jdoe@ubuntu ~/Downloads $ ls /opt/poky/
1.2 1.2.1 </pre>
==Configure==
Open a terminal and type:

<pre> export PATH=/opt/poky/1.2/sysroots/i686-pokysdk-linux/usr/bin/armv7a-vfp-neon-poky-linux-gnueabi:$PATH </pre>
=Compiled binaries=
Binaries: latest stable kernel version IGEP OMAP3 devices is: '''2.6.37-12 (20161206)'''

{| border="1"
|-
!|'''Platform'''
!|'''Kernel source'''
!|'''zImage binary (igep00x0_defconfig)'''
!|'''Modules binaries (igep00x0_defconfig)'''
!|'''zImage binary (igep00x0_wilink8_defconfig)'''
!|'''Modules binaries (igep00x0_wilink8_defconfig)'''
!|'''Compat Wireless source (only for igep00x0_wilink8_defconfig)'''
!|'''Firmware binaries (only for igep00x0_wilink8_defconfig)'''
|-
||IGEP00x0
||[http://downloads.isee.biz/pub/releases/linux_kernel/v2.6.37-12/linux-omap-2.6.37-12.tar.gz 2.6.37-12]([http://downloads.isee.biz/pub/releases/linux_kernel/v2.6.37-12/linux-omap-2.6.37-12.tar.gz.md5 md5sum])
||[http://downloads.isee.biz/pub/releases/linux_kernel/v2.6.37-12/zImage-2.6.37-12.bin zImage-2.6.37-12.bin] ([http://downloads.isee.biz/pub/releases/linux_kernel/v2.6.37-12/zImage-2.6.37-12.bin.md5 md5sum])
||[http://downloads.isee.biz/pub/releases/linux_kernel/v2.6.37-12/modules-2.6.37-12.tar.gz modules-2.6.37-12]([http://downloads.isee.biz/pub/releases/linux_kernel/v2.6.37-12/modules-2.6.37-12.tar.gz.md5 md5sum)]
||[http://downloads.isee.biz/pub/releases/linux_kernel/v2.6.37-12/zImage-2.6.37-12-wilink8.bin zImage-2.6.37-12-wilink8.bin]([http://downloads.isee.biz/pub/releases/linux_kernel/v2.6.37-12/zImage-2.6.37-12-wilink8.bin.md5 md5sum])
||[http://downloads.isee.biz/pub/releases/linux_kernel/v2.6.37-12/modules-2.6.37-12-wilink8.tar.gz modules-2.6.37-12-wilink8]([http://downloads.isee.biz/pub/releases/linux_kernel/v2.6.37-12/modules-2.6.37-12-wilink8.tar.gz.md5 md5sum)]
||[http://downloads.isee.biz/pub/releases/linux_kernel/v2.6.37-12/compat-wireless-wilink8-0.tar.gz compat-wireless-wilink8-0]([http://downloads.isee.biz/pub/releases/linux_kernel/v2.6.37-12/compat-wireless-wilink8-0.tar.gz.md5 md5sum])
||[http://downloads.isee.biz/pub/releases/linux_kernel/v2.6.37-12/ti-connectivity-wilink8-0.tar.gz ti-connectivity-wilink8-0]([http://downloads.isee.biz/pub/releases/linux_kernel/v2.6.37-12/ti-connectivity-wilink8-0.tar.gz.md5 md5sum)]
|}
=Build kernel from sources=
'''Download''' the latest stable version sources and follow next steps:

<pre>wget <a class="external free" href="http://downloads.isee.biz/pub/releases/linux_kernel/v2.6.37-12/linux-omap-2.6.37-12.tar.gz" target="_blank" rel="nofollow noreferrer noopener">http://downloads.isee.biz/pub/releases/linux_kernel/v2.6.37-12/linux-omap-2.6.37-12.tar.gz</a>
tar xzf linux-omap-2.6.37-12.tar.gz
cd linux-omap-2.6.37-12
</pre>
Also, it could download from GIT Repositories ([http://git.isee.biz/ http://git.isee.biz/]) and test the last unstable version at your own risk (see "''Linux mainline tree (development)''" chapter in [index.php/The_Linux_kernel The Linux kernel])

==Important procedures==
* Remove rootfs modules binaries from any previous Kernel
* If you switch to another configuration, clean kernel sources with command: make mrproper

==igep00x0_defconfig==
'''Configure''' Linux kernel for IGEP OMAP3 old Marvell WIFI:

<pre>make ARCH=arm igep00x0_defconfig
</pre>
Then '''build''' the kernel and kernel modules. The result will be an ''zImage'' file in arch/arm/boot directory. Execute:

<pre>make ARCH=arm CROSS_COMPILE=[your cross compiler] zImage modules
</pre>
For example, if you are using IGEP SDK Yocto Toolchain then you should execute following cmdline:

<pre>make ARCH=arm CROSS_COMPILE=arm-poky-linux-gnueabi- zImage modules
</pre>
You can '''install''' the kernel image to your target boot

<pre>cp arch/arm/boot/zImage /media/boot/zImage
</pre>
You can '''install''' the kernel modules to your target rootfs

<pre>make ARCH=arm modules_install INSTALL_MOD_PATH=[path to your target rootfs]</pre>
=Kernel Parameters=
This chapter describes some [index.php/How_do_I_edit_my_kernel_command_line kernel command line] parameters you can pass to the kernel during system startup. They also depend on the presence of the hardware with which they are associated.

The '''board.ei485''' parameter allows to use UART1 as RS232 port instead of EI485

<pre> board.ei485= [yes, no]
Format: <string>
no: disable ei485, use UART1 as RS232, supported by igep0020
default: yes
</pre>
The '''buddy''' parameter allows enable or disable expansion boards

<pre> buddy= [igep0022, base0010]
Format: <string>
igep0022: enable expansion board, supported by igep0020
board
base0010: enable expansion board, supported by igep0030
board and igep0032 (only rev. B)
ilms0015: enable expansion board, supported by igep0030
board
default: none
</pre>
The '''buddy.revision''' parameter allows to pass hardware revision for buddy boards

<pre> buddy.revision= [A, B]
Format: <string>
A: enable hardware buddy revision A, only available for base0010
B: enable hardware buddy revision B, only available for base0010
default: A
</pre>
The '''buddy.modem''' parameter allows enable or disable modem

<pre> buddy.modem= [yes]
Format: <string>
yes: enable modem on buddy board, supported by igep0022 expansion board.
default: none
</pre>
==Scenarios==
Consider the following situations:

'''Scenario A.''' You have and IGEP0020 board plus IGEP0022 expansion board, then you should add in your [index.php/How_do_I_edit_my_kernel_command_line kernel command line]

<pre>buddy=igep0022
</pre>
Optionally, to enable the IGEP0022 modem which is disabled by default you should add in your [index.php/How_do_I_edit_my_kernel_command_line kernel command line]

<pre>buddy=igep0022 buddy.modem=yes
</pre>
NOTE: UART2 can be used for bluetooth OR modem in expansion board but NOT at same time. They are INCOMPATIBLE.

'''Scenario B.''' You have and IGEP0030 board plus BASE0010 expansion board, then you should add in your [index.php/How_do_I_edit_my_kernel_command_line kernel command line]

<pre>buddy=base0010
</pre>
'''Scenario C.''' You have and IGEP0030 board plus BASE0010 Rev. B expansion board, then you should add in your [index.php/How_do_I_edit_my_kernel_command_line kernel command line]

<pre>buddy=base0010 buddy.revision=B
</pre>
'''Scenario D.''' You have and IGEP0032 board plus BASE0010 Rev. B expansion board, then you should add in your [index.php/How_do_I_edit_my_kernel_command_line kernel command line]

<pre>buddy=base0010 buddy.revision=B
</pre>
'''Scenario E.''' You have and IGEP0030 board plus ILMS0015 expansion board, then you should add in your [index.php/How_do_I_edit_my_kernel_command_line kernel command line]

<pre>buddy=ilms0015
</pre>
=Layout=
Machine specific files are located in '''arch/arm/mach-omap2/''' directory with name '''board-igep*.c''' :

* '''board-igep0020.c''': For IGEP0020 machine
* '''board-igep0030.c''': For IGEP0030 machine
* '''board-igep0032.c''': For IGEP0032 machine

Expansion board files, also are located in '''arch/arm/mach-omap2/''' directory with name '''exp-*.c''' :

* '''exp-igep0022.c''': For IGEP0022 expansion board
* '''exp-base0010.c''': For BASE0010 expansion board
* '''exp-ilms0015.c''': For ILMS0015 expansion board

=Adding New Expansion Boards=
This chapter is meant to be a starting point for people to learn how to add your own expansion board in three steps.

==Step 1: Add new expansion board file==
As you can see in Layout chapter, an expansion board is called exp-<your board name>.c and should be located in arch/arm/mach-omap2 directory, so the first step will be add a new file for your new expansion board. Following example creates a new expansion board file called exp-dummy.c (arch/arm/mach-omap2/exp-dummy.c)

<pre> #include <linux/kernel.h>
#include <linux/init.h>

void __init dummy_init(void)
{
pr_info("Initializing expansion board ... \n");
}
</pre>
next, add the new file to be built

<pre>diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile
index 7505be9..a6572f2 100644
--- a/arch/arm/mach-omap2/Makefile
+++ b/arch/arm/mach-omap2/Makefile
@@ -156,6 +156,7 @@ obj-$(CONFIG_MACH_IGEP0020) += board-igep0020.o \
obj-$(CONFIG_MACH_IGEP0030) += board-igep0030.o \
board-igep00x0.o \
exp-base0010.o \
+ exp-dummy.o \
hsmmc.o
obj-$(CONFIG_MACH_OMAP3_TOUCHBOOK) += board-omap3touchbook.o \
hsmmc.o
</pre>
==Step 2: Register new expansion board==
Now, edit board-igep00x0.h and add an identifier for the new expansion board, for example,

<pre>diff --git a/arch/arm/mach-omap2/board-igep00x0.h b/arch/arm/mach-omap2/board-igep00x0.h
index 6b9b677..a2325d7 100644
--- a/arch/arm/mach-omap2/board-igep00x0.h
+++ b/arch/arm/mach-omap2/board-igep00x0.h
@@ -15,6 +15,7 @@
#define IGEP00X0_BUDDY_NONE 0x01
#define IGEP00X0_BUDDY_IGEP0022 0x01
#define IGEP00X0_BUDDY_BASE0010 0x02
+#define IGEP00X0_BUDDY_DUMMY 0x03

#define IGEP00X0_BUDDY_HWREV_A (1 << 0)
#define IGEP00X0_BUDDY_HWREV_B (1 << 1)
</pre>
also, edit in board-igep00x0.c the buddy_early_param to add the new expansion board,

<pre>diff --git a/arch/arm/mach-omap2/board-igep00x0.c b/arch/arm/mach-omap2/board-igep00x0.c
index 2a2d8eb..f2b5b27 100644
--- a/arch/arm/mach-omap2/board-igep00x0.c
+++ b/arch/arm/mach-omap2/board-igep00x0.c
@@ -192,6 +192,9 @@ static int __init buddy_early_param(char *str)
if (!strcmp(name, "base0010")) {
igep00x0_buddy_pdata.model = IGEP00X0_BUDDY_BASE0010;
pr_info("IGEP: IGEP0030 machine + BASE0010 (buddy)\n");
+ } else if (!strcmp(name, "dummy")) {
+ igep00x0_buddy_pdata.model = IGEP00X0_BUDDY_DUMMY;
+ pr_info("IGEP: IGEP0030 machine + DUMMY (buddy)\n");
} else
pr_err("IGEP: Unknown buddy for IGEP0030 machine\n");
}
</pre>
==Step 3: Run expansion board initialization==
Finally, modify the machine file and add support for the new expansion board, for example:

<pre>diff --git a/arch/arm/mach-omap2/board-igep0030.c b/arch/arm/mach-omap2/board-igep0030.c
index 2b97257..44b319d 100644
--- a/arch/arm/mach-omap2/board-igep0030.c
+++ b/arch/arm/mach-omap2/board-igep0030.c
@@ -204,6 +204,8 @@ static struct omap_board_mux board_mux[] __initdata = {

/* Expansion board: BASE0010 */
extern void __init base0010_init(struct twl4030_platform_data *pdata);
+/* Expansion board: DUMMY */
+extern void __init dummy_init(void);

static void __init igep0030_init(void)
{
@@ -223,6 +225,10 @@ static void __init igep0030_init(void)
/* - BASE0010 (adds twl4030_pdata) */
if (igep00x0_buddy_pdata.model == IGEP00X0_BUDDY_BASE0010)
base0010_init(&twl4030_pdata);
+ /* - DUMMY */
+ if (igep00x0_buddy_pdata.model == IGEP00X0_BUDDY_DUMMY)
+ dummy_init();
+

/* Add twl4030 common data */
omap3_pmic_get_config(&twl4030_pdata, TWL_COMMON_PDATA_USB |
</pre>
=Known issues=
See [http://processors.wiki.ti.com/index.php/AM35x-OMAP35x-PSP_04.02.00.07_Release_Notes#Known_Issues_-_AM.2FDM37x http://processors.wiki.ti.com/index.php/AM35x-OMAP35x-PSP_04.02.00.07_Release_Notes#Known_Issues_-_AM.2FDM37x]

==modules are not installed correctly==
Try to change rootfs owner from root to your username.

<pre> sudo chown <username> -R /media/rootfs</pre>
==wlcore: Unknown symbol==
Probably, you didn't erase old module binaries from rootfs. Open IGEP terminal and type:

<pre>depmod -a
depmod -A </pre>
Finally reboot the system

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Francesc Megias

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