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Gregory Nutt 2016-03-28 18:01:22 -06:00
parent 8c6d42843d
commit d0036e5ff1
1 changed files with 45 additions and 12 deletions
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configs/sabre-6quad/README.txt
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@ -194,8 +194,8 @@ 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 (Attempt #1)
----------------------------
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:
@ -237,8 +237,8 @@ scratch. It builds, but it does not run. Here are the things I did:
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 (Attempt #2)
-----------------------------------------
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
@ -248,8 +248,8 @@ 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 (Attempt #3)
---------------------------------
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?
@ -281,17 +281,50 @@ another SD card containing the nuttx.bin image?
7. Then we can boot NuttX off the rescanned SD card:
MX6Q SABRESD U-Boot > fatload mmc 2 0x20010000 nuttx.bin
MX6Q SABRESD U-Boot > fatload mmc 2 0x10800000 nuttx.bin
reading nuttx.bin
87260 bytes read
MX6Q SABRESD U-Boot > go 0x2001040
## Starting application at 0x02001040 ...
MX6Q SABRESD U-Boot > go 0x10800040
## Starting application at 0x10800040 ...
MX6Q SABRESD U-Boot >
That seems to work okay.
That seems to work okay and this is more than enough of this kind of
thing for a day.
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
-----------------------------