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This document describes various specifics of the '''DEV-Qseven-i.MX''' development board (100-1510-X) as far as the '''Bluetechnix i.MX53 Linux Board Support Package''' is concerned.

= Quick start =
Here is how to start with your Qseven-i.MX537 module and your development board DEV-Qseven-i.MX.

*Insert the Qseven module into the development board.
*Set the S3 DIP switches on the development board to {{dipswitch|0|0|0|1}}
*Connect 12V DC to power connector X16.
*Hold down S2 (PON) for 1 second.
*Press button S4 shortly.
*Connect a monitor via HDMI (X3) and/or a USB cable to the Debug UART port (X10) to see the board's boot messages.

= Boot modes =
The DEV-Qseven-i.MX carrier board allows to configure the module's boot mode via a DIP switch (S3).
*S3-1: Qseven BIOS_DISABLE#/BOOT_ALT# pin
*S3-2: Qseven MFG_NC3 pin: JTAG_TMS (S3-4 OFF) or additional boot mode pin (S3-4 ON)
*S3-3: JTAG reference voltage selection; fixed to OFF for Qseven-i.MX537
*S3-4: Qseven MFG_NC4=JTAG_TRST pin: Multiplex JTAG signals (OFF) or Debug UART signals (ON) onto MFG_NC[0..4] pins

== SPI NOR flash ==
{{supporttable|Qseven-i.MX537|≥V1.1}}
{|
|-
|S3 || {{dipswitch|0|0|0|X}}
|-
|}
If S3-4 is switched ON, press button S4 shortly after power-on to continue boot.

== SD (Secure Digital) card ==
The boot device is the SD card on the DEV-Qseven-i.MX, not the one on the Qseven-i.MX537.
{{supporttable|Qseven-i.MX537|≥V1.2}}
{|
|-
| S3 || {{dipswitch|1|0|0|X}}
|-
|}
If S3-4 is switched ON, press button S4 shortly after power-on to continue boot.

== USB ==
{{supporttable|Qseven-i.MX537|≥V1.1}}
Boot from USB-OTG (X11).

''NOTE: The ''mfgtool'' requires this boot mode to be set.''

{|
|-
| S3 || {{dipswitch|X|1|0|1}}
|}
Press button S4 shortly after power-on to continue boot.

= Power-On/Reset =
*Press button S2 for 500ms to power up the module. (If S3-4 is ON, press button S4 shortly after power-on to continue boot.)
*Press button S2 for min. 1s to induce a Linux shutdown on the module.
*Press button S1 to reset the module.

= Debug UART =
The debug UART (UART1 of i.MX53) is multiplexed with the JTAG signal lines onto the MFG_NC[0..4] pins of the Qseven module. Switch S3 allows for selection of those signals.
{|
|-
| width="150" | JTAG signals connected || S3 || {{dipswitch|X|X|X|0}}
|-
| Debug UART connected || S3 || {{dipswitch|X|X|X|1}}
|-
|}
;IMPORTANT!
:If you select ''Debug UART'' mode, you have to press button S4 each time you power on or reboot the Qseven module.
:(This is because the multiplex line is the JTAG_TRST line which halts the processor initially if it is low.)

= JTAG connector =
;IMPORTANT!
:If your JTAG device/connector shortens pins #1 and #2 of the 20-pin JTAG-ARM connector (X15), you must not connect this device to DEV-Qseven-i.MX.

= CAN bus termination =
Termination can be enabled by setting jumper JP1 to position 2-3.

= Mini-PCI-Express connector =
Available interfaces on this connector, which are usable with the i.MX53, are
*USB
*I2C

There are a lot of modules on the market that share the same connector, but do not share the same pin assignment. Nevertheless, many of those modules can be inserted into the DEV-Qseven-i.MX, '''but be sure to check and compare the pin assignment before.'''

= I/O Expander =
The DEV-Qseven-i.MX features 2 16-bit I/O expander chips. These are registered in Linux as GPIOs number #224 to #255.

To handle these GPIOs in Linux userspace, we use the popular ''sysfs-gpio'' driver. See the following examples or ''rpm/BUILD/linux/Documentation/gpio.txt'' for more information.
*Set GPIO no. 228 as output with value low
echo 228 > /sys/class/gpio/export
echo low > /sys/class/gpio/gpio228/direction
*Set GPIO no. 228 as output with value high
echo 228 > /sys/class/gpio/export
echo high > /sys/class/gpio/gpio228/direction
*Set GPIO no. 228 as input and read its value
echo 228 > /sys/class/gpio/export
echo in > /sys/class/gpio/gpio228/direction
cat /sys/class/gpio/gpio228/value

Here is the table of important GPIOs and their function.
{| class="wikitable"
|-
! GPIO no. !! Direction !! Function
|-
| 224 || in || RTC interrupt
|-
| 234 || in || Mini PCI-E WAKE# pin
|-
| 236 || out || Mini PCI-E PERST# pin
|-
| 237 || out || Mini PCI-E W_DISABLE# pin
|-
|}

= Linux kernel configuration =
There is a Linux kernel parameter for the DEV-Qseven-i.MX base board which enables some specific features at boot time. Add this to your ''bootargs_base'' variable in U-Boot.

*Boot U-Boot
*Press any key to stop Linux kernel boot, you will get to U-Boot's prompt.
*Add the Linux kernel parameter:
Qseven-i.MX537 U-Boot> setenv bootargs_base $(bootargs_base) <span style="color:#009900">devq7imx</span>

If you want to make this change permanent (usually you will) also do:
Qseven-i.MX537 U-Boot> saveenv
This will write the environment to permanent storage.

[[Category:i.MX53]]

Linux BSP customization for DEV-Qseven-i.MX - Versionsgeschichte

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