board: tbs2910: add documentation
This documents the u-boot installation procedure and the hardware in order to get started. Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org> [trini: Add MAINTAINERS entry for doc file per Soeren's request]
This commit is contained in:
Denis 'GNUtoo' Carikli
Tom Rini
parent
9658884f3d
commit
f3767bcb31
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@ -4,4 +4,5 @@ S: Maintained
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F: arch/arm/dts/imx6q-tbs2910.dts
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F: board/tbs/tbs2910/
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F: configs/tbs2910_defconfig
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F: doc/board/tbs/
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F: include/configs/tbs2910.h
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@ -18,5 +18,6 @@ Board-specific doc
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rockchip/index
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sifive/index
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st/index
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tbs/index
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toradex/index
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xilinx/index
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@ -0,0 +1,9 @@
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.. SPDX-License-Identifier: GPL-2.0+
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TBS
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===
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.. toctree::
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:maxdepth: 2
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tbs2910
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@ -0,0 +1,191 @@
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TBS2910 Matrix ARM miniPC
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=========================
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Building
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--------
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To build u-boot for the TBS2910 Matrix ARM miniPC, you can use the following
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procedure:
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First add the ARM toolchain to your PATH
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Then setup the ARCH and cross compilation environment variables.
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When this is done you can then build u-boot for the TBS2910 Matrix ARM miniPC
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with the following commands:
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.. code-block:: none
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make mrproper
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make tbs2910_defconfig
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make
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Once the build is complete, you can find the resulting image as u-boot.imx in
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the current directory.
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UART
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----
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The UART voltage is at 3.3V and its settings are 115200bps 8N1
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BOOT/UPDATE boot switch:
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------------------------
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The BOOT/UPDATE switch (SW11) is connected to the BOOT_MODE0 and
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BOOT_MODE1 SoC pins. It has "BOOT" and "UPDATE" markings both on
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the PCB and on the plastic case.
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When set to the "UPDATE" position, the SoC will use the "Boot From Fuses"
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configuration, and since BT_FUSE_SEL is 0, this makes the SOC jump to serial
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downloader.
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When set in the "BOOT" position, the SoC will use the "Internal boot"
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configuration, and since BT_FUSE_SEL is 0, it will then use the GPIO pins
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for the boot configuration.
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SW6 binary DIP switch array on the PCB revision 2.1:
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----------------------------------------------------
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On that PCB revision, SW6 has 8 positions.
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Switching a position to ON sets the corresponding
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register to 1.
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See the following table for a correspondence between the switch positions and
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registers:
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=============== ============
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Switch position Register
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=============== ============
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1 BOOT_CFG2[3]
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2 BOOT_CFG2[4]
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3 BOOT_CFG2[5]
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4 BOOT_CFG2[6]
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5 BOOT_CFG1[4]
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6 BOOT_CFG1[5]
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7 BOOT_CFG1[6]
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8 BOOT_CFG1[7]
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=============== ============
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For example:
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- To boot from the eMMC: 1:ON , 2:ON, 3:ON, 4:OFF, 5:OFF, 6:ON, 7:ON, 8:OFF
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- To boot from the microSD slot: 1: ON, 2: OFF, 3: OFF, 4: OFF, 5:OFF, 6:OFF,
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7:ON, 8:OFF
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- To boot from the SD slot: 1: OFF, 2: ON, 3: OFF, 4: OFF, 5:OFF, 6:OFF, 7:ON,
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8:OFF
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- To boot from SATA: 1: OFF, 2: OFF, 3: OFF, 4: OFF, 5:OFF, 6:ON, 7:OFF, 8:OFF
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You can refer to the BOOT_CFG registers in the I.MX6Q reference manual for
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additional details.
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SW6 binary DIP switch array on the PCB revision 2.3:
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----------------------------------------------------
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On that PCB revision, SW6 has only 4 positions.
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Switching a position to ON sets the corresponding
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register to 1.
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See the following table for a correspondence between the switch positions and
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registers:
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=============== ============
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Switch position Register
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=============== ============
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1 BOOT_CFG2[3]
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2 BOOT_CFG2[4]
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3 BOOT_CFG2[5]
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4 BOOT_CFG1[5]
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=============== ============
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For example:
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- To boot from the eMMC: 1:ON, 2:ON, 3:ON, 4:ON
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- To boot from the microSD slot: 1:ON, 2:OFF, 3:OFF, 4:OFF
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- To boot from the SD slot: 1:OFF, 2:ON, 3:OFF, 4:OFF
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You can refer to the BOOT_CFG registers in the I.MX6Q reference manual for
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additional details.
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Loading u-boot from USB:
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------------------------
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If you need to load u-boot from USB, you can use the following instructions:
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First build imx_usb_loader, as we will need it to load u-boot from USB. This
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can be done with the following commands:
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.. code-block:: none
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git clone git://github.com/boundarydevices/imx_usb_loader.git
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cd imx_usb_loader
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make
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This will create the resulting imx_usb binary.
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When this is done, you can copy the u-boot.imx image that you built earlier
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in in the imx_usb_loader directory.
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You will then need to power off the TBS2910 Matrix ARM miniPC and make sure that
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the boot switch is set to "UPDATE"
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Once this is done you can connect an USB cable between the computer that will
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run imx_usb and the TBS2910 Matrix ARM miniPC.
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If you also need to access the u-boot console, you will also need to connect an
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UART cable between the computer running imx_usb and the TBS2910 Matrix ARM
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miniPC.
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Once everything is connected you can finally power on the TBS2910 Matrix ARM
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miniPC. The SoC will then jump to the serial download and wait for you.
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Finlay, you can load u-boot through USB with with the following command:
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.. code-block:: none
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sudo ./imx_usb -v u-boot.imx
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The u-boot boot messages will then appear in the serial console.
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Install u-boot on the eMMC:
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---------------------------
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To install u-boot on the eMMC, you first need to boot the TBS2910 Matrix ARM
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miniPC.
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Once booted, you can flash u-boot.imx to mmcblk0boot0 with the
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following commands:
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.. code-block:: none
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sudo echo 0 >/sys/block/mmcblk0boot0/force_ro
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sudo dd if=u-boot.imx of=/dev/mmcblk0boot0 bs=1k seek=1; sync
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Note that the eMMC card node may vary, so adjust this as needed.
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Once the new u-boot version is installed, to boot on it you then need to power
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off the TBS2910 Matrix ARM miniPC.
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Once it is off, you need make sure that the boot switch is set to "BOOT" and
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that the SW6 switch is set to boot on the eMMC as described in the previous
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sections.
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If you also need to access the u-boot console, you will also need to connect an
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UART cable between the computer running imx_usb and the TBS2910 Matrix ARM
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miniPC.
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You can then power up the TBS2910 Matrix ARM miniPC and U-Boot messages will
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appear in the serial console.
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Booting a distribution:
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-----------------------
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When booting on the TBS2910 Matrix ARM miniPC, by default U-Boot will first try
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to boot from hardcoded offsets from the start of the eMMC. This is for
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compatibility with the stock GNU/Linux distribution.
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If that fails it will then try to boot from several interfaces using
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'distro_bootcmd': It will first try to boot from the microSD slot, then the
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SD slot, then the internal eMMC, then the SATA interface and finally the USB
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interface. For more information on how to configure your distribution to boot,
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see 'README.distro'.
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Links:
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------
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- https://www.tbsdtv.com/download/document/tbs2910/TBS2910-Matrix-ARM-mini-PC-SCH_rev2.1.pdf
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- The schematics for the revision 2.1 of the TBS2910 Matrix ARM miniPC.
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- https://cache.freescale.com/files/32bit/doc/ref_manual/IMX6DQRM.pdf - The
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SoC reference manual for additional details on the BOOT_CFG registers.
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