Merged nuttx/boards into master
This commit is contained in:
ziggurat29
commit
fb09d47df4
@ -11,6 +11,7 @@ Contents
|
||||
- Platform Features
|
||||
- Serial Console
|
||||
- LEDs and Buttons
|
||||
- Using U-Boot to Run NuttX
|
||||
- Configurations
|
||||
|
||||
Status
|
||||
@ -29,6 +30,10 @@ that case).
|
||||
There is a lot of testing that could be done but, unfortunately, I still
|
||||
have no i.MX6 hardware to test on.
|
||||
|
||||
2016-03-28: I now have a used MCIMX6Q-SDB which is similar to the target
|
||||
configuration described below except that it does not have the 10.1" LVDS
|
||||
display. Next step: Figure out how to run a copy of NuttX using U-Boot.
|
||||
|
||||
Platform Features
|
||||
=================
|
||||
|
||||
@ -179,6 +184,147 @@ apparently, running normally. If the LED is flashing at approximately
|
||||
Buttons
|
||||
-------
|
||||
|
||||
Using U-Boot to Run NuttX
|
||||
-------------------------
|
||||
|
||||
The MCIMX6Q-SDB comes with a 8GB SD card containing the U-Boot and Android.
|
||||
You simply put the SD card in the SD card slot SD3 (on the bottom of the
|
||||
board next to the HDMI connect) and Android will boot.
|
||||
|
||||
But we need some other way to boot NuttX. Here are some things that I have
|
||||
experimented with.
|
||||
|
||||
Building U-Boot (Failed Attempt #1)
|
||||
-----------------------------------
|
||||
|
||||
I have been unsuccessful getting building a working version of u-boot from
|
||||
scratch. It builds, but it does not run. Here are the things I did:
|
||||
|
||||
1. Get a copy of the u-boot i.MX6 code via:
|
||||
|
||||
https://github.com/boundarydevices/u-boot-imx6/tree/production
|
||||
|
||||
or
|
||||
|
||||
$ git clone git://git.denx.de/u-boot.git
|
||||
|
||||
2. Build U-Boot for the i.MX6Q Sabre using the following steps. This
|
||||
assumes that you have the path to your arm-none-eabi- toolchain at the
|
||||
beginning of your PATH variable:
|
||||
|
||||
$ cd u-boot
|
||||
$ export ARCH=arm
|
||||
$ export CROSS_COMPILE=arm-none-eabi-
|
||||
$ make mx6qsabresd_config
|
||||
$ make
|
||||
|
||||
This should create a number of files, including u-boot.imx
|
||||
|
||||
3. Format an SD card
|
||||
|
||||
Create a FAT16 partition at an offset of about 1MB into the SD card.
|
||||
This is where we will put nuttx.bin.
|
||||
|
||||
4. Put U-Boot on SD. U-boot should reside at offset 1024B of your SD
|
||||
card. To put it there, do:
|
||||
|
||||
$ dd if=u-boot.imx of=/dev/<your-sd-card> bs=1k seek=1
|
||||
$ sync
|
||||
|
||||
Your SD card device is typically something in /dev/sd<X> or
|
||||
/dev/mmcblk<X>. Note that you need write permissions on the SD card
|
||||
for the command to succeed, so you might need to su - as root, or use
|
||||
sudo, or do a chmod a+w as root on the SD card device node to grant
|
||||
permissions to users.
|
||||
|
||||
Using the Other SD Card Slot (Failed Attempt #2)
|
||||
------------------------------------------------
|
||||
|
||||
Another option is to use the version u-boot that came on the 8GB but put
|
||||
NuttX on another SD card inserted in the other SD card slot at the opposite
|
||||
corner of the board.
|
||||
|
||||
To make a long story short: This doesn't work. As far as I can tell,
|
||||
U-Boot does not support any other other SC card except for mmc 2 with is the
|
||||
boot SD card slot.
|
||||
|
||||
Replace Boot SD Card (Successful Attempt #3)
|
||||
--------------------------------------------
|
||||
|
||||
What if you remove the SD card after U-boot has booted, then then insert
|
||||
another SD card containing the nuttx.bin image?
|
||||
|
||||
1. Build nuttx.bin and copy it only a FAT formated SD card. Insert the SD
|
||||
card containing NuttX into the "other" SD card slot. Insert the 8GB SD
|
||||
card with U-boot already on it in the normal, boot SD card slot.
|
||||
|
||||
2. Connect the VCOM port using the USB port next to the boot SD card slot.
|
||||
|
||||
3. Start a console at 11500 8N1 on the VCOM port
|
||||
|
||||
4. Power up the board with the 8GB SD card in place. U-Boot will start and
|
||||
countdown before starting Linux. Press enter to break into U-Boot before
|
||||
Linux is started.
|
||||
|
||||
5. Remove the 8GB U-Boot SD card; insert in its place.
|
||||
|
||||
6. Rescan the SD card:
|
||||
|
||||
MX6Q SABRESD U-Boot > mmc dev 2
|
||||
mmc2 is current device
|
||||
MX6Q SABRESD U-Boot > mmc rescan
|
||||
MX6Q SABRESD U-Boot > fatls mmc 2
|
||||
system volume information/
|
||||
87260 nuttx.bin
|
||||
|
||||
1 file(s), 1 dir(s)
|
||||
|
||||
7. Then we can boot NuttX off the rescanned SD card:
|
||||
|
||||
MX6Q SABRESD U-Boot > fatload mmc 2 0x10800000 nuttx.bin
|
||||
reading nuttx.bin
|
||||
|
||||
87260 bytes read
|
||||
MX6Q SABRESD U-Boot > go 0x10800040
|
||||
## Starting application at 0x10800040 ...
|
||||
|
||||
That seems to work okay.
|
||||
|
||||
Use the FAT Partition on the 8GB SD Card (Untested Idea #4)
|
||||
-----------------------------------------------------------
|
||||
|
||||
Partition 4 on the SD card is an Android FAT file system. So one thing you
|
||||
could do would be put the nuttx.bin file on that partition, then boot like:
|
||||
|
||||
MX6Q SABRESD U-Boot > fatload mmc 2:4 0x10800000 nuttx.bin
|
||||
|
||||
SD Card Image Copy (Successful Attempt #5)
|
||||
-------------------------------------
|
||||
|
||||
You can use the 'dd' command to copy the first couple of megabytes from the
|
||||
8GB SD card and copy that to another SD card. You then have to use 'fdisk'
|
||||
to fix the partition table and to add a single FAT16 partition at an offset
|
||||
of 1MB or so.
|
||||
|
||||
1. Insert the 8GB boot SD card into your PC: Copy the first 2Mb from the SD
|
||||
card to a file:
|
||||
|
||||
$ dd if=/dev/sdh of=sdh.img bs=512 count=4096
|
||||
|
||||
2. Remove the 8GB boot SD card and replace it with a fresh SD card. Copy the
|
||||
saved file to the first the new SD card:
|
||||
|
||||
$ dd of=/dev/sdh if=sdh.img bs=512 count=4096
|
||||
|
||||
3. Then make a FAT16 partition at the end of the SD card. You will also need
|
||||
to format the partion for FAT.
|
||||
|
||||
4. You can put nuttx.bin here and then boot very simply with:
|
||||
|
||||
MX6Q SABRESD U-Boot > fatload mmc 2:1 0x10800000 nuttx.bin
|
||||
MX6Q SABRESD U-Boot > go 0x10800040
|
||||
|
||||
A little hokey, but not such a bad solution.
|
||||
|
||||
Configuration sub-directories
|
||||
-----------------------------
|
||||
|
||||
Loading…
Reference in New Issue
Block a user