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AM6412: AM64 Reference board using SD card as primary boot and emmc as backup boot

Gobinath Krishnamoorthy
Prodigy 20 points

Part Number: AM6412

Tool/software:

Hello,

I am working with an AM6412 based board  and attempting to configure it to use an SD card as the primary boot device and eMMC as the backup boot device. Here are the boot parameters I am using:

  • primary_boot_mode {3,4,5,6} = {0,0,0,1}
  • primary_boot_mode_config {7,8,9} = {0,0,1}
  • backup_boot_mode {10,11,12} = {1,0,1}
  • backup_boot_mode_config {13} = {0}

My questions are:

  1. Does the AM64 support this boot mode configuration?
  2. If supported, does the eMMC operate in filesystem mode or RAW mode?

I have attempted to configure the eMMC in filesystem mode by formatting it with a FAT32 filesystem and copying the TI firmware files (tiboot3.bin, tispl.bin, and u-boot.img). However, I encounter the following error in U-Boot:

Can someone help me to understand whats going on....
```

U-Boot SPL 2021.01-00839-g01a6ba4432-dirty (Jul 09 2024 - 01:04:51 +0000)
.Resetting on cold boot to workaround ErrataID:i2331
resetting ...

U-Boot SPL 2021.01-00839-g01a6ba4432-dirty (Jul 09 2024 - 01:04:51 +0000)
.SYSFW ABI: 3.1 (firmware rev 0x0008 '8.4.7--v08.04.07 (Jolly Jellyfi')
SPL initial stack usage: 13384 bytes
Trying to boot from MMC2
MMC: no card present
spl: mmc init failed with error: -123
Trying to boot from MMC1
MMC Device 0 not found
spl: could not find mmc device 0. error: -19
SPL: failed to boot from all boot devices
### ERROR ### Please RESET the board ###
```

  • 0
    TI__Guru* 89611 points

    Hello,

    Gobinath Krishnamoorthy said:
    Does the AM64 support this boot mode configuration?

    Yes, the ROM does support that bootmode configuration.

    Gobinath Krishnamoorthy said:
    If supported, does the eMMC operate in filesystem mode or RAW mode?

    The ROM only supports FS mode in eMMC backup boot.

    Gobinath Krishnamoorthy said:
    Can someone help me to understand whats going on....

    You said you are configuring to boot from eMMC FS but the logs indicate the U-Boot is trying to boot further images from SD card. Could you please clarify what media you are really booting from?

    Regards,

    Prashant

  • 0 in reply to Prashant Shivhare
    Prodigy 20 points

    Hi Prashant,

    Sorry for the late reply. To answer your question, in our board-specific code...[board/tirefboard/am64x/cb.c]

    We configured the board to boot from the SD card first and try the eMMC second.

    void board_boot_order(u32 *spl_boot_list)
{	
	spl_boot_list[0] = BOOT_DEVICE_MMC2;
	spl_boot_list[1] = BOOT_DEVICE_MMC1;	
}

    Therefore, I'm assuming it tried the SD card first. Since no SD card was present, it attempted to load the image from the eMMC.

    I have partially solved the above issue, as the R5-specific DTS file doesn't have the eMMC configuration.

    Here is the latest log on this issue: now tispl.bin is trying to load u-boot.img, but it fails.

    U-Boot SPL 2021.01-00839-g01a6ba4432-dirty (Jul 10 2024 - 17:27:00 -0700)

    SYSFW ABI: 3.1 (firmware rev 0x0008 '8.4.7--v08.04.07 (Jolly Jellyfi')

    No NAND flash

    Trying to boot from MMC2

    MMC: no card present

    spl: mmc init failed with error: -123

    Trying to boot from MMC1

    Error reading cluster

    ** Unable to read file u-boot.img **

    No matching DT out of these options:





  • 0 in reply to Gobinath Krishnamoorthy
    TI__Guru* 89611 points

    Hello,

    Can you once try booting from eMMC alone? This is to see if the issue is originating specifically from the U-Boot first trying to boot from SD card and then eMMC.

    Regards,

    Prashant