AM69: AM69

Hi Walter,

Can you try using the below mksdboot.sh script to partition the eMMC.

0312.mksdboot.sh

The uenv.txt.base refers to the uEnv.txt present in <linux sdk folder>/board-support/prebuilt-images/.

Regards

Gokul

Hi Gokul,

Appreciate your pointer and information.  I have some followup questions:

. mksdboot.sh created mmcblk0p1 which doesn't have anything?  What is the purpose of it?
. lsblk also listed mmcblk0boot0 and mmcblk0boot1.  What is the purpose of them?
. after eMMC programming, AM69 still relies on SD to boot into u-boot so that to setenv for mmcdev and bootpart in order to boot kernel and rootfs from eMMC.  How can AM69 fully boot up from eMMC wihtout a programmed SD card inserted into sd slot?
. Once AM69 can fully boot from eMMC, how to switch back to boot from SD?

Thanks.

Walter

Hi Chow,

Walter Chow said:

. mksdboot.sh created mmcblk0p1 which doesn't have anything?  What is the purpose of it?

The mksdboot.sh should ideally create 2 partitions for mmcblk0:mmcblk0p1 and mmcblk0p2  with the command:[./mksdboot.sh --device /dev/mmcblk0] as mentioned in the below link:

software-dl.ti.com/.../How_to_flash_emmc_device.html

Walter Chow said:

. lsblk also listed mmcblk0boot0 and mmcblk0boot1.  What is the purpose of them?

These are raw partitions of the emmc which can be used for storing the boot files.

Walter Chow said:

after eMMC programming, AM69 still relies on SD to boot into u-boot so that to setenv for mmcdev and bootpart in order to boot kernel and rootfs from eMMC.  How can AM69 fully boot up from eMMC wihtout a programmed SD card inserted into sd slot?

Can to try switching to the eMMC(user) partition configuration given below.Instead of SW8 use SW11 and instead of SW9 use SW7 respectively.No need to to consider SW3 as it is don't care configuration.

Also make sure you have the boot files upto uboot in mmcblk0p1 and the rootfs in mmcblk0p2.Then set mmcdev and bootpart after entering into UBOOT.

Walter Chow said:

. Once AM69 can fully boot from eMMC, how to switch back to boot from SD?

To switch back to SD boot mode,just use the MMCSD bootswitch settings below.Instead of SW8 use SW11 and instead of SW9 use SW7 respectively.No need to to consider SW3 as it is don't care configuration.More info regarding the bootswitch settings can be found in the below link.

software-dl.ti.com/.../J784S4_EVM_Hardware_Setup.html

Regards

Gokul

Hi Gokul,

I followed the steps from the link of software-dl.ti.com/.../How_to_flash_emmc_device.html 
and mksdboot.sh created two partitions, mmcblk0p1 and mmcblk0p2.  The link only has information
how to set up the rootfs by copying it into mmcblk0p2 but it doesn't explain what mmcblk0p1  is used for.
Do you have information what mmcblk0p1 is used for?

Regarding mmcblk0boot0 and mmcblk0boot1, can you advise what boot files should be stored there, and
how to make use of these two raw partitions?

I am not sure how to locate those switches you mentioned.  The AM69 SK hardware Setup has inofrmation
how to set the boot pings to SD boot mode but not eMMC boot mode.  Can you advise?

Thanks.

Walter

HI Walter,

Walter Chow said:

Do you have information what mmcblk0p1 is used for?

mmcblk0p1 can be used for storing the boot files using a FAT32 filesystem just like how we can store the boot files in raw partitions like mmcblk0boot0 and mmcblk0boot1.

Walter Chow said:

Regarding mmcblk0boot0 and mmcblk0boot1, can you advise what boot files should be stored there, and
how to make use of these two raw partitions?

I suggest you to go through section 3.1.1.5.5. in the below link for gaining info regarding that:

https://software-dl.ti.com/jacinto7/esd/processor-sdk-linux-am69/10_00_07_06/exports/docs/linux/Foundational_Components/U-Boot/UG-Memory.html#booting-tiboot3-bin-tispl-bin-and-u-boot-img-from-emmc-boot-partition-for-k3-class-of-socs

Walter Chow said:

I am not sure how to locate those switches you mentioned.  The AM69 SK hardware Setup has inofrmation
how to set the boot pings to SD boot mode but not eMMC boot mode.  Can you advise?

Regarding this , the switch configurations are mentioned in the below document ,but this is for j721E.For AM69 , just need to compare the same with SD boot mode settings present in the AM69SK hardware setup and just update the switch numbers.The configuration of the switches remains the same.

TDA4_FLASHING_TECHNIQUES.pdf

Hi Gokul,

It seems that mmcblk0p1, mmcblk0boot0 and mmcblk0boot1 are used to store the boot files but the difference lies on that 
mmcblk0p1 needs to use a FAT32 filesystem.  Section 3.1.1.5.5 has information how to activate mmcblk0boot0 (via
mmc partconf 0 1 1 1) and mmcblk0boot1 (via mmc partconf 0 1 2 1) so that either one of them will be chosen for eMMC
boot.  Can mmcblk0p1 be activated so that it will be chosen for eMMC boot?

Thanks.

Walter

Hi Walter,

Walter Chow said:

Can mmcblk0p1 be activated so that it will be chosen for eMMC boot?

Really sorry,I forgot to say that for eMMC boot from mmcblk0p1 , [mmc partconf 0 1 7 1] can be used.Also ,for convenience , I am attaching a link sharing the entire steps to boot from mmcblk0p1 without SD card.

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1459027/faq-am69a-booting-from-emmc-without-sd-card

Regards

Gokul

Hi Gokul,

I am not able to activate mmcblk0p1 to be chosen for eMMC boot by doing:

. using the mksdboot script to set up the mmcblk0p1  and mmcblk0p2
. copy the bootloader files (tiboot3.bin, tispl.bin, u-boot.img) from SD (mmcblk1p1) to mmcblk0p1
. setup the rootfs by copying files from SD (mmcblk1p2) to mmcblk0p2
. do the 'sync'
. power cycle and then stop at u-boot do do 'mmc partconf 0 1 7 1' and 'mmc bootbus 0 2 0 0'
. power off, and then update dip siwtch on SW2 to do eMMC boot.
. power on but nothing happen.

Can you advise?

By following instructions from section 3.1.1.5.5, I am able to do eMMC boot from either mmcblk0boot0
(via mmc partconf 0 1 1 1 ) or mmcblk0boot1 (via mmc partconf 0 1 2 1).  However, I need to stop at u-boot
do do "setenv mmcdev 0" and "setenv bootpart 0:2".  Can you advise what can be done to automate booting 
from eMMC rootfs on mmcblk0p2?

Thanks.

Walter

Hi Walter ,

Walter Chow said:

. power off, and then update dip siwtch on SW2 to do eMMC boot.

Its not SW2 that you have to update.

You will have to switch to the eMMC(user) mode configuration given below where Instead of SW8 use SW11 and instead of SW9 use SW7 respectively.No need to to consider SW3 as it is don't care configuration.

Hi Gokul,

The links below refer that to SW2:

https://software-dl.ti.com/jacinto7/esd/processor-sdk-linux-am69/10_01_08_01/exports/docs/linux/How_to_Guides/Hardware_Setup_with_CCS/AM69_SK_Hardware_Setup.html#am69-sk  (Fig. 4.2 AM69 SK boot pins)

https://www.ti.com/lit/ug/spruj70a/spruj70a.pdf?ts=1736294879056&ref_url=https%253A%252F%252Fdocs.u-boot.org%252Fen%252Flatest%252Fboard%252Fti%252Fj784s4_evm.html (2.2.1 Board Configuration Settings [SW2])

Thanks.

Walter

Hi Walter,

I actually interchanged it with AM69 board instead of AM69-SK.Sorry for that confusion.

Regarding the AM69-SK,I discussed it with the development team and they said that taking the boot files from emmc UDA is not supported.However rootfs can be taken from mmcblk0p2.

Regards

Gokul

Hi Gokul,

Appreciate your help.  Do you have any pointer to tell difference between AM69 board and AM69-SK?

In addition, can you advise my quetions in previous post:

By following instructions from section 3.1.1.5.5, I am able to do eMMC boot from either mmcblk0boot0
(via mmc partconf 0 1 1 1 ) or mmcblk0boot1 (via mmc partconf 0 1 2 1).  However, I need to stop at u-boot
do do "setenv mmcdev 0" and "setenv bootpart 0:2".  Can you advise what can be done to automate booting 
from eMMC rootfs on mmcblk0p2?

Thanks.

Walter

Hi Walter,

Walter Chow said:

Do you have any pointer to tell difference between AM69 board and AM69-SK?

AM69 is the base general purpose device, and AM69-SK adds the HW accelerated AI functionality to it.

AM69-SK Linux SDK adds AI libraries, and has an Vision AI-oriented Out Of Box GUI demo, as opposed to the Graphics Display HMI Out Of Box GUI demo of AM69.

Walter Chow said:

By following instructions from section 3.1.1.5.5, I am able to do eMMC boot from either mmcblk0boot0
(via mmc partconf 0 1 1 1 ) or mmcblk0boot1 (via mmc partconf 0 1 2 1).  However, I need to stop at u-boot
do do "setenv mmcdev 0" and "setenv bootpart 0:2".  Can you advise what can be done to automate booting 
from eMMC rootfs on mmcblk0p2?

To automate booting from emmc rootfs,the saveenv feature will have to be enabled.I am attaching the steps for the same below.

I am reattaching the changes to be made in the j784s4_evm_a72 def config file for better visibility:

Hi Gokul,

Thanks.  I will look into enabling the saveenv in u-boot.

For AM69 starter kit, 

. does it support "USB Device Firmware Upgrade (DFU)?

. does it support PCIe Gen 2?

Thanks.

Walter

Hi Walter,

Walter Chow said:

. does it support "USB Device Firmware Upgrade (DFU)?

Yes,it supports it.You can also refer to the below link for more info.

https://software-dl.ti.com/jacinto7/esd/processor-sdk-linux-am69/latest/exports/docs/linux/Foundational_Components/U-Boot/UG-DFU.html

Walter Chow said:

. does it support PCIe Gen 2?

Regarding this , can you raise a new E2E.

Regards Gokul

Hi Gokul,

For u-boot saveenv, does u-boot for AM 69 have a equivalent *.env mentioned by https://git.ti.com/cgit/ti-u-boot/ti-u-boot/tree/board/ti/am62x/am62x.env?h=09.01.00.008#n30?
For CONFIG_SYS_MMC_ENV_PART=1, does it mean that the changes will be saved into mmcblk0boot0?
For CONFIG_ENV_OFFSET=0x680000, where is this location?  I am not sure which location it will be by looking out the emmc layout mentioned by https://software-dl.ti.com/jacinto7/esd/processor-sdk-linux-am69/10_01_08_01/exports/docs/linux/Foundational_Components/U-Boot/UG-Memory.html (Extracted below:)

           boot0 partition (8 MB)                        user partition
   0x0+----------------------------------+      0x0+-------------------------+
      |     tiboot3.bin (512 KB)         |         |                         |
 0x400+----------------------------------+         |                         |
      |       tispl.bin (2 MB)           |         |                         |
0x1400+----------------------------------+         |        rootfs           |
      |       u-boot.img (4 MB)          |         |                         |
0x3400+----------------------------------+         |                         |
      |      environment (128 KB)        |         |                         |
0x3500+----------------------------------+         |                         |
      |   backup environment (128 KB)    |         |                         |
0x3600+----------------------------------+         |                         |
      |          sysfw (1 MB)            |         |                         |
0x3E00+----------------------------------+         +-------------------------+

Regarding DFU, what is the pin settings on SW2 so that it will work with DFU?

Regarding the PCIe Gen 2, sure I will file a new one.

Thanks.

Walter

HI Walter,

Walter Chow said:

For CONFIG_SYS_MMC_ENV_PART=1, does it mean that the changes will be saved into mmcblk0boot0?

Yes , that is correct.

Walter Chow said:

For CONFIG_ENV_OFFSET=0x680000, where is this location?  I am not sure which location it will be by looking out the emmc layout mentioned

This offset refers to the byte offset.However the addreses in the emmc layout mentioned are sector addresses.1 Sector is 512 bytes.Hence the byte offset 0x680000 corresponds to a sector offset of 0x3400(ie:0x680000 divided by 0x200(512 in decimal).

Walter Chow said:

For u-boot saveenv, does u-boot for AM 69 have a equivalent *.env mentioned by https://git.ti.com/cgit/ti-u-boot/ti-u-boot/tree/board/ti/am62x/am62x.env?h=09.01.00.008#n30?

• Yes AM69, uses j784s4.env present in the <SDK Folder>/board-support/<u-boot folder>/board/ti/j784s4/j784s4.env