I’m running QNX 7.1 on the Raspberry Pi 4B (BSP_raspberrypi-bcm2711-rpi4_br-710_be-710_SVN946248_JBN18) from an SD card. I can see the Internal File System and the SD card file systems as shown below.
# df -h -P
Filesystem Size Used Available Capacity Mounted on
ifs 22M 22M 0 100% /
/dev/sd0 30G 30G 0 100%
However, I’m unable to mount an SD card partition and enable read/write to the filesystem (mkdir doesn’t work in ifs). These are the commands I used with the console output:
I tried formatting using mkdosfs /dev/sd0t12 but the command froze for a couple of hours without completion and I had to kill it with Ctrl+C. I’m assuming it should not take that long to format the partition.
Shouldn’t adding the partition with fdisk /dev/sd0 add -t 12 already format it for the correct type? Is there any other command I can use rather than mkdosfs if that keeps hanging?
Why not just format the SD card under Windows or Linux if you are just using it as FAT32. You don’t need QNX to format FAT32.
It takes a lot longer than expected to format large drives under QNX. I think it’s a lot of error checking. I know on our systems that we use hard drives and these days they all come in terrabyte sizes and if we format the whole drive it takes a LONG time so we always partition into a small chunk (3-4 gigs) since that’s all we use anyway.
I did try formatting the SD card to FAT32 under Windows but after booting to QNX, I did not see any partitions in the partition table.
# df -h -P
Filesystem Size Used Available Capacity Mounted on
ifs 22M 22M 0 100% /
/dev/sd0 30G 30G 0 100%
# mount -e /dev/sd0
# fdisk /dev/sd0 show
_____OS_____ Start End ______Number______ Size Boot
name type Cylinder Cylinder Cylinders Blocks
1. ------ --- -------- -------- ------- -------- -----
2. ------ --- -------- -------- ------- -------- -----
3. ------ --- -------- -------- ------- -------- -----
4. ------ --- -------- -------- ------- -------- -----
I get the same problem even when I create more than one FAT32 partition in Windows. The partition table for the SD card in QNX still contains no entries. If I transfer the SD card back to the Windows host, I’m able to see the formatted FAT32 partition(s) again. Am I missing something here?
It should also be noted that I’m copying the BSP and required firmware files to the FAT32 partition on the SD card and booting QNX from there. Can this possibly affect the FAT32 partition on the filesystem after booting into QNX?
On my targets, I use QNX 6.6.0, not QNX 7.1 but this should not make any difference.
My targets also boots from the SDcard.
There is a FAT16 partition for the OS (IFS file) and a QNX6 partition for data storage (PPS persistence files, database files…). There is also a reserved area for the IPL.
The boot sequence is : The µP loads the IPL content which itself loads the IFS (from FAT16 partition) which itself boots QNX.
Is your device driver correctly configured (pin muxing, I/O address, interrupt…) ?
Here is the command I use for one of the SDcard interfaces of my targets : devb-sdmmc-mx6_generic dos sfn=windows disk name=hd_sd_usr_u cam pnp,verbose sdio addr=0x02190000,irq=54,bs=cd_base=0x0209c000:cd_pin=1:cd_irq=161 blk rw,cache=2M,automount=hd_sd_usr_u0@dos:/mnt/sdhc-user-up
Note : My targets have 3 SDcard interfaces. One for system (embedded µSD) and 2 for user data (externally accessible SD).
I’ve honestly don’t recall ever using or needing ‘mount -e’ option. I wonder if running it is confusing things.
At this point below, everything looks fine since you can see /dev/sd0.
# df -h -P
Filesystem Size Used Available Capacity Mounted on
ifs 22M 22M 0 100% /
/dev/sd0 30G 30G 0 100%
Since you know it’s already formatted FAT32 from windows, you should be able to mount it directly now via the the command you were doing in your 1st post.
I’m assuming this is because I’m not specifying the required options for the SD card interface on the Raspberry Pi 4B. How can I find the correct options that are required for this target device?
Note, QNX requires legacy boot options in the BIOS (not sure what the your board has) as it doesn’t support UEFI (unless something changed really recently).
Unless you need a DOS partition, I would try mkqnx6fs.
The issue with formatting on Windows might have to do with the type of partition table. I’m not sure if QNX has move beyond the old IBM-PC BIOS version, though I know there is supposed to be support for UEFI. I’ve not been able to get it to work.
Running “mount -e” to enumeriate is always needed, but not necessarily manually. There are driver parameters that will cause it to happen automatically as well as mounting the partition into the file system. You would have to look up the docs as I am unfamiliar with the details.
mkqnx6fs command hangs as well. I tried formatting a small 128 MB QNX6 partition (created with fdisk /dev/sd0 add -t 177 -c 0,128) and it still didn’t get to completion.
I think the DOS partition formatted on Windows is not detected in QNX since I’m unable to initialize the SD card driver correctly as @nico04 suggested.
I’m assuming this is because I’m not specifying any options when running the driver. How can I find the target specific options required to initialize the SD card driver for the Raspberry Pi 4B?
Turns out there was a known issue with the SDMMC driver in the Raspberry Pi 4B BSP. It works with the following workaround: devb-sdmmc-bcm2711 sdio addr=0xfe340000,irq=158 disk name=sd
