Hi,
I've been attempting to get the UltraZed_IOCC_BSP to boot and run the rootfs off the SD card. I can import the fresh BSP and build it, using those images the example boots as an initramfs image fine. I can log in, etc.
Step 1:
If I merely switch Image Packaging Configuration -> Root Filesystem Type to "SD card". Then I rebuild with petalinux-build. I then put BOOT.BIN, image.ub and system.dtb on the first fat32 partition of 1 gig on a 16 gig sd-card. I then use 'dd' to write rootfs.ext3 to the second partition.
Kernel begins to boot, but fails some time after the logging to the serial port stops. (See #2 below). Here is a link to the boot log:
Step 2:
If I go in and add the console=ttyPS0,115200 stuff to the boot args (petalinux-config -> Kernel Bootargs) I notice it's pointing the rootfs to the wrong partition, so I update the argument string.
Original: earlycon clk_ignore_unused root=/dev/mmcblk0p2 rw rootwait
Updated: earlycon earlyprintk clk_ignore_unused root=/dev/mmcblk1p2 rw rootwait console=ttyPS0,115200
This works better as I can now see that I'm getting a kernel panic:
Bad mode in Error handler detected on CPU1, code 0xbf000000 -- SError
Step 3:
Based on some research I discovered that as it's delivered, the BSP does not configure a write protect pin for the SD card in the device tree. (MIO 44) - however the system will look for the write protect jumper status (SD_WP_N on the carrier board). This prevents a partition from being mounted in RW mode. If you put 'disable-wp;' in the @sdhci0/1 device tree entries in system-user.dtsi, this pin (MIO 44?) will no be referenced and you can mount the filesystems on the card in RW mode.
I was able to verify this works in initramfs, but it did not fix the above kernel panic.
Question: Do you see that I'm doing something wrong here? Has anyone run into this before? It seems like this should be a simple operation, but I've been working on various iterations of the build for several days and nothing seems to work. I would love some insight on a procedure that works (or a working BSP would be AMAZING)
Thank you in advance for any help!
