TDA4VM: how to save the data in emmc, that can be get when mcu1_0 boot

lify

Part Number: TDA4VM
Other Parts Discussed in Thread: UNIFLASH

hi ti

I need to store some data, which still exists after reboot. And i will read out the data when mcu1_0 init. How to save and read ?

over 2 years ago

0 Diwakar Dhyani over 2 years ago

TI__Guru 56845 points

Hi fengying li

Which sdk you are using what is the boot flow?

Regards
Diwakar

0 lify over 2 years ago in reply to Diwakar Dhyani

Intellectual 290 points

hi Diwakar

Our SDK is using linuc+rtos. The SDK version is 08.02.00.03.

0 Diwakar Dhyani over 2 years ago in reply to lify

TI__Guru 56845 points

Hi fengying li

Can you tell me your boot flow SPL or SBL ?

Regards
Diwakar

0 lify over 2 years ago in reply to Diwakar Dhyani

Intellectual 290 points

hi Diwakar

It's SPL.

0 Diwakar Dhyani over 2 years ago in reply to lify

TI__Guru 56845 points

Hi fengying li

So the Rom code initialise the emmc if you are using emmc boot mode then once it load R5 spl

,Now R5 SPL will initialise emmc for the next stage booting.

So after the nc1_o init only your emmc is up.

Can you elaborate your exact use case.

Regards
Diwakar

0 lify over 2 years ago in reply to Diwakar Dhyani

Intellectual 290 points

hi Diwakar

There are some property values nedd to be store, the value will not change when board power off. It will be read out as the condition to initial mcan parameter in mcu1_0 initialization.

0 Diwakar Dhyani over 2 years ago in reply to lify

TI__Guru 56845 points

Hi fengying li

Which boot mode you are using are you using emmc boot mode? as emmc will get initialised only in emmc boot mode.

In which partition of the emmc you want to keep the data , what is the format type ?

Regards
Diwakar

0 lify over 2 years ago in reply to Diwakar Dhyani

Intellectual 290 points

hi Diwakar

Yes,we will boot from emmc. The partition file as fllowing. I will keep the data in persist partion, this part will not format when flash image. Does the format of stored data affect the storage and reading methods？At present, I want to store some integer data。

tda4-j721s2/linux-sdk / board-support/u-boot/include/configs/j721s2_evm.h

#define PARTS_DEFAULT \
/* Linux partitions */ \
"name=rootfs_a,start=0,size=4096M,uuid=${uuid_gpt_rootfs_a};"\
"name=rootfs_b,size=4096M,uuid=${uuid_gpt_rootfs_b};"\
"name=cache,size=4096M,uuid=${uuid_gpt_cache};"\
"name=persist,size=200M,uuid=${uuid_gpt_persist};"\
"name=data,size=-,uuid=${uuid_gpt_data}\0"

0 Diwakar Dhyani over 2 years ago in reply to lify

TI__Guru 56845 points

Hi fengying li

By format means is it FAT,ext4 ...?

Regards
Diwakar

0 lify over 2 years ago in reply to Diwakar Dhyani

Intellectual 290 points

hi Diwakar

I'm so sorry, I understand wrong! Persist part file system is ext4.

0 Diwakar Dhyani over 2 years ago in reply to lify

TI__Guru 56845 points

Hi fengying li

Is there any particular requirement to store the data to the emmc we can store your static data in some array inside the code itself.

As it is ext4 it will require some time to check how to do this in SPL.

Regards
Diwakar

0 Diwakar Dhyani over 2 years ago in reply to Diwakar Dhyani

TI__Guru 56845 points

Hi fengying li

Ext4 is supported in the SPL you need to enable this flag CONFIG_SPL_FS_EXT4 in your config file

In SPL you can change the code in spl_mmc.c to read from the ext4 partition of the emmc.

Example code:

/*Function call*/
spl_read_data(mmc_get_blk_desc(mmc),2,"/home/root/test.txt");//2 is the partion no 


/*Function Defination*/
int spl_read_data(struct blk_desc *block_dev,int partition,const char *filename)
{

        s32 err;
        struct disk_partition part_info = {};
        char buf[20]={0};
        loff_t filelen, actlen;

        if (part_get_info(block_dev, partition, &part_info)) {
                printf("spl: no partition table found\n");
                return -1;
        }

        ext4fs_set_blk_dev(block_dev, &part_info);

        err = ext4fs_mount(0);
        if (!err) {
#ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
                printf("%s: ext4fs mount err - %d\n", __func__, err);
#endif
                return -1;
        }
        err = ext4fs_open(filename, &filelen);
        if (err < 0) {
                puts("spl: ext4fs_open failed\n");
        }
        else
        {
                puts("spl:ext4fs_open pass\n");
        }
       err = ext4fs_read((char *)buf, 0, sizeof(buf), &actlen);
       if (err < 0) {
                puts("spl: ext4fs_read failed\n");
        }
       else
       {
                printf("spl: ext4fs_read PASS %s\n",buf);
       }

}

Regards
Diwakar

0 lify over 2 years ago in reply to Diwakar Dhyani

Intellectual 290 points

hi Diwakar

How to get the store data when mcu1_0 boot ? It will be read out as the condition to initial mcan parameter in mcu1_0 initialization

0 Diwakar Dhyani over 2 years ago in reply to lify

TI__Guru 56845 points

Hi fengying li

Before MC1_0 you will not be able to get the data from the emmc once the mc1_0 is up it will initialise the emmc so that R5 SPL can get the second stage image.

,so once the emmc is up after MCU1_0 init you can get the stored data.

When you want your mcan parameter , you can read the parameter after initialising the emmc.

Help me in understanding where exactly you are facing the issue?

Regards
Diwakar

0 lify over 2 years ago in reply to Diwakar Dhyani

Intellectual 290 points

hi Diwakar

I want to store some data, which will not be lost or changed even if the power is off. Our mcan is in mcu1-0. Every time the board bootup,When MCu1_0 is started, I need to read the stored data every time to decide how to initialize the register of mcan. I don't kown how to store and read out. i need to read it out when mcu1_0 initial.

0 Diwakar Dhyani over 2 years ago in reply to lify

TI__Guru 56845 points

Hi fengying li

lify said:
Our mcan is in mcu1-0

can you elaborate more on this is mcan code is inside mc1_0 (R5 spl )?

SPL boot flow is like this

ROM code -->R5 SPL--> A72 SPL -->-ATF-->OPTEE->UBOOT -->LINUX

You can see boot flow here:

software-dl.ti.com/.../Foundational_Components_U-Boot.html

Do you want to get the store data during MC1_0 initialisation which is done by ROM code or when the R5 SPL is running on it ?

Regards
Diwakar

0 lify over 2 years ago in reply to Diwakar Dhyani

Intellectual 290 points

hi Diwakar

Thanks a lot for your help and I'm so sorry I didn't express myself clearly.

in file tda4\rtos-sdk\vision_apps\platform\j721e\rtos\mcu1_0\main.c

static void appMain(void* arg0, void* arg1)
{
TaskP_Handle sciserverInitTask;
TaskP_Params sciserverInitTaskParams;

appUtilsTaskInit();

appSciserverSciclientInit();

/* Initialize SCI Client Server */
TaskP_Params_init(&sciserverInitTaskParams);
sciserverInitTaskParams.priority = INIT_SCISERVER_TASK_PRI;
sciserverInitTaskParams.stack = gSciserverInitTskStack;
sciserverInitTaskParams.stacksize = sizeof (gSciserverInitTskStack);

sciserverInitTask = TaskP_create(appSciserverInit, &sciserverInitTaskParams);
if(NULL == sciserverInitTask)
{
OS_stop();
}

appInit();
snrRemoteSericeInit();
appDiagnosticServiceInit();
App_mcanInit();---------> I need to read the store data here.

.....

.........}

0 lify over 2 years ago in reply to lify

Intellectual 290 points

hi Diwakar

Is it possible to achieve？

0 lify over 2 years ago in reply to lify

Intellectual 290 points

hi Diwakar

Waiting for your reply,thanks a lot.

0 Parth Nagpal over 2 years ago in reply to lify

TI__Mastermind 42135 points

Hi,

Catching up with thread here.

Is there any specific requirement for storing the data in eMMC? How big is the data that you wanna store?

Regards,
Parth

0 lify over 2 years ago in reply to Parth Nagpal

Intellectual 290 points

hi Parth

We need to store a value when the board is started for the first time (This value may be modified in future system operation ). In each subsequent boot process, this value is read out when the mcan is initialized. For example, if the read value is 1, then can0 is configured as can protocol. If the read value is 2, can0 is configured as canfd protocol. I want to ask how to store this value and how to read it after storage.

Our mcan driver is in mcu1_ 0, the code is as follows, tda4\rtos-sdk\vision_apps\platform\j721e\rtos\mcu1_0\main.c

static void appMain(void* arg0, void* arg1)
{
TaskP_Handle sciserverInitTask;
TaskP_Params sciserverInitTaskParams;

appUtilsTaskInit();

appSciserverSciclientInit();

sciserverInitTask = TaskP_create(appSciserverInit, &sciserverInitTaskParams);
if(NULL == sciserverInitTask)
{
OS_stop();
}

appInit();
snrRemoteSericeInit();
appDiagnosticServiceInit();
App_mcanInit();---------> I need to read the store data in this function.

.....

.........}

0 lify over 2 years ago in reply to lify

Intellectual 290 points

hi Parth

How big is the data that you wanna store?

------------------------>The data mcan need is a byte, If possible, we also want to store some can messages during the operation of mcan and read them after the next mcan startup. These data are less than 3KB.

0 lify over 2 years ago in reply to lify

Intellectual 290 points

hi Parth

Any progress? Waiting for your reply， thanks a lot!

0 Parth Nagpal over 2 years ago in reply to lify

TI__Mastermind 42135 points

Hi,

Do you have OSPI flash on your system? We can store and read the data in the flash at any point of time. We just need to make sure it is not used by Linux.

Regards,
Parth

0 lify over 2 years ago in reply to Parth Nagpal

Intellectual 290 points

hi Parth

There is no OSPI flash on our system.

0 Parth Nagpal over 2 years ago in reply to lify

TI__Mastermind 42135 points

Do you have any non-volatile memory other than eMMC? Storing and reading from eMMC is not gonna be straight forward in this case as Linux will also me using the eMMC.

0 lify over 2 years ago in reply to Parth Nagpal

Intellectual 290 points

hi Parth

There is no non-volatile memory other than eMMC. Any other method can do this?

0 Parth Nagpal over 2 years ago in reply to lify

TI__Mastermind 42135 points

Hi,

You can use the eMMCs boot partition to store and read the data. Please refer to the file <PDK>/packages/ti/board/utils/uniflash/target/src/emmc/emmc.c
If you are on SDK 8.5 or above, you can also refer to <PDK>/packages/ti/boot/sbl/src/emmc as well.

Regards,
Parth

0 lify over 2 years ago in reply to Parth Nagpal

Intellectual 290 points

hi Parth

how to store and read? Is there a example?

0 Parth Nagpal over 2 years ago in reply to lify

TI__Mastermind 42135 points

Hi,

Is this issue still open?

Did you refer to the example above?

Parth Nagpal said:
You can use the eMMCs boot partition to store and read the data. Please refer to the file <PDK>/packages/ti/board/utils/uniflash/target/src/emmc/emmc.c
If you are on SDK 8.5 or above, you can also refer to <PDK>/packages/ti/boot/sbl/src/emmc as well.

Regards,
Parth

0 lify over 2 years ago in reply to Parth Nagpal

Intellectual 290 points

hi Parth

yes, is there any examples about store and read the data?

0 Parth Nagpal over 2 years ago in reply to lify

TI__Mastermind 42135 points

Hi,

Apologies for long silence.

what exactly is pending on this issue?

Parth Nagpal said:
You can use the eMMCs boot partition to store and read the data. Please refer to the file <PDK>/packages/ti/board/utils/uniflash/target/src/emmc/emmc.c
If you are on SDK 8.5 or above, you can also refer to <PDK>/packages/ti/boot/sbl/src/emmc as well.

I believe the above reference should serve as a good reference for your use case.

Regards,
Parth

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TDA4VM: how to save the data in emmc, that can be get when mcu1_0 boot