AM62A7: Load Programs from EMMC Boot1 in SBL

Hello,

Kevin Peng said:

Hence, customer wants to know if we have plan to support using EMMC boot 1 to load the programs in SBL, and how could we do that?

Currently, there is no plan to support it. The best I can do now is check the customer's changes for any mistakes.

Can you ask the customer to share the changes they have done till now & the boot logs as well for better understanding of the issue?

Thanks! 

I want to switch the EMMC BOOT partition in the SBL user application by MMCSD_enableBootPartition function, but I find that the switch is failed.

However MMCSDRaw_imgRead function is forced to EMMC BOOT0.  the MMCSDRaw_imgRead function code following:

static int32_t MMCSDRaw_imgRead(void *dst, uint32_t len, void *args)
{
    int32_t status = SystemP_SUCCESS;

    Bootloader_MmcsdArgs *MMCSDArgs = (Bootloader_MmcsdArgs *)args;
    MMCSD_Handle handle = MMCSD_getHandle(MMCSDArgs->MMCSDIndex);

    if(handle == NULL)
	{
	   status = SystemP_FAILURE;
	}

    if(status == SystemP_SUCCESS)
    {
        status = MMCSD_enableBootPartition(handle, 1);

        if(status != SystemP_SUCCESS)
        {

        }
        else
        {
            status = Bootloader_MmcsdRaw_readFromOffset(handle, dst, len, MMCSDArgs->curOffset);

            if(status != SystemP_SUCCESS)
            {
                DebugP_log("[MMCSDRaw_imgRead] Failed \r\n");
            }
            else
            {
                DebugP_log("[MMCSDRaw_imgRead] Sucess \r\n");
                CacheP_wb(dst, len, CacheP_TYPE_ALL);
                MMCSDArgs->curOffset += len;
            }
        }
    }

    return status;
}

 I try deletd the line of 

ERROR: Bootloader_socCpuResetRelease:861: CPU set boot address failed for a530-0
ERROR: Bootloader_socCpuRelease:496: CPU release failed for a530-0

Tom XIAO said:

 I try deletd the line of 

status = MMCSD_enableBootPartition(handle, 1);

To enable access to eMMC Boot1 partition, the corresponding call would be `MMCSD_enableBootPartition(handle, 2)`.

Based on certain logic, you can modify the `MMCSDRaw_imgRead` to enable either the Boot0 (partitionNum = 1) or Boot1 (partitionNum = 2) partition so that the reads happen from the enabled partition.

So we can write a API to read current boot partition Number?

But why deleted the line,it report error.

I think when the rom bootloader loading the SBL it means the code from the BOOT0 or BOOT1

Tom XIAO said:

So we can write a API to read current boot partition Number?

The logic should involve enabling Boot0/1 partition based on the location of the image to be booted.

Tom XIAO said:

But why deleted the line,it report error.

If that line is deleted, the boot partition doesn't get enabled & the image is not read, parsed, and loaded.

Yes,I want this API.and the API implement by TI? or we develop?

No , we need read the register from EMMC which BOOT0 or BOOT1. We need a API to read the EMMC current partition.

I do not think it is needed. The boot partition to enable is known beforehand & can be enabled irrespective of the current active boot partition.