Update README
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Gregory Nutt
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@ -11,6 +11,7 @@ Contents
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- Platform Features
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- Serial Console
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- LEDs and Buttons
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- Using U-Boot to Run NuttX
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- Configurations
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Status
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@ -29,6 +30,10 @@ that case).
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There is a lot of testing that could be done but, unfortunately, I still
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have no i.MX6 hardware to test on.
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2016-03-28: I now have a used MCIMX6Q-SDB which is similar to the target
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configuration described below except that it does not have the 10.1" LVDS
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display. Next step: Figure out how to run a copy of NuttX using U-Boot.
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Platform Features
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=================
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@ -179,6 +184,114 @@ apparently, running normally. If the LED is flashing at approximately
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Buttons
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-------
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Using U-Boot to Run NuttX
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-------------------------
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The MCIMX6Q-SDB comes with a 8GB SD card containing the U-Boot and Android.
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You simply put the SD card in the SD card slot SD3 (on the bottom of the
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board next to the HDMI connect) and Android will boot.
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But we need some other way to boot NuttX. Here are some things that I have
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experimented with.
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Building U-Boot (Attempt #1)
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----------------------------
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I have been unsuccessful getting building a working version of u-boot from
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scratch. It builds, but it does not run. Here are the things I did:
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1. Get a copy of the u-boot i.MX6 code via:
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https://github.com/boundarydevices/u-boot-imx6/tree/production
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or
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$ git clone git://git.denx.de/u-boot.git
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2. Build U-Boot for the i.MX6Q Sabre using the following steps. This
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assumes that you have the path to your arm-none-eabi- toolchain at the
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beginning of your PATH variable:
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$ cd u-boot
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$ export ARCH=arm
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$ export CROSS_COMPILE=arm-none-eabi-
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$ make mx6qsabresd_config
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$ make
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This should create a number of files, including u-boot.imx
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3. Format an SD card
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Create a FAT16 partition at an offset of about 1MB into the SD card.
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This is where we will put nuttx.bin.
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4. Put U-Boot on SD. U-boot should reside at offset 1024B of your SD
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card. To put it there, do:
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$ dd if=u-boot.imx of=/dev/<your-sd-card> bs=1k seek=1
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$ sync
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Your SD card device is typically something in /dev/sd<X> or
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/dev/mmcblk<X>. Note that you need write permissions on the SD card
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for the command to succeed, so you might need to su - as root, or use
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sudo, or do a chmod a+w as root on the SD card device node to grant
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permissions to users.
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Using the Other SD Card Slot (Attempt #2)
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-----------------------------------------
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Another option is to use the version u-boot that came on the 8GB but put
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NuttX on another SD card inserted in the other SD card slot at the opposite
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corner of the board.
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To make a long story short: This doesn't work. As far as I can tell,
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U-Boot does not support any other other SC card except for mmc 2 with is the
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boot SD card slot.
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Replace Boot SD Card (Attempt #3)
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---------------------------------
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What if you remove the SD card after U-boot has booted, then then insert
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another SD card containing the nuttx.bin image?
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1. Build nuttx.bin and copy it only a FAT formated SD card. Insert the SD
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card containing NuttX into the "other" SD card slot. Insert the 8GB SD
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card with U-boot already on it in the normal, boot SD card slot.
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2. Connect the VCOM port using the USB port next to the boot SD card slot.
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3. Start a console at 11500 8N1 on the VCOM port
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4. Power up the board with the 8GB SD card in place. U-Boot will start and
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countdown before starting Linux. Press enter to break into U-Boot before
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Linux is started.
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5. Remove the 8GB U-Boot SD card; insert in its place.
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6. Rescan the SD card:
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MX6Q SABRESD U-Boot > mmc dev 2
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mmc2 is current device
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MX6Q SABRESD U-Boot > mmc rescan
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MX6Q SABRESD U-Boot > fatls mmc 2
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system volume information/
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87260 nuttx.bin
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1 file(s), 1 dir(s)
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7. Then we can boot NuttX off the rescanned SD card:
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MX6Q SABRESD U-Boot > fatload mmc 2 0x20010000 nuttx.bin
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reading nuttx.bin
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87260 bytes read
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MX6Q SABRESD U-Boot > go 0x2001040
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## Starting application at 0x02001040 ...
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MX6Q SABRESD U-Boot >
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That seems to work okay and this is more than enough of this kind of
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thing for a day.
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Configuration sub-directories
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-----------------------------
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