How to modify RetryCount

Robotics & Edge Computing Jetson & Embedded Systems Jetson AGX Orin
1

Hi,nvidia
I am using the board of Jeston Orin
Can i modify the slotA or slotB 's retry count on the linux

4

Hi shuochong.liu,

The variable(RootfsRetryCountMax) is configured as locked so that you can not configure it in runtime.
Please specify ROOTFS_RETRY_COUNT_MAX in flash command as Flashing the Target Board with a Redundant Root File Systems during flash.

5

Hi
I found that slotA or slotB’s retry count is stored in a register.
So I want to know if I can modify the value of this register on Linux.

6

Which register do you mean?
As I know, it is stored in efi variable and locked by default.
We don’t suggest user configuring it so that we configure it locked.

7

The registers that will be read during system warm boot.

STATIC
EFI_STATUS
EFIAPI
SyncSrRfAndmRootfsInfo (
  IN  UINT32  Direction,
  OUT UINT32  *RegisterValue
  )
{
  EFI_STATUS  Status = EFI_SUCCESS;

  switch (Direction) {
    case FROM_REG_TO_VAR:
      // Copy CurrentSlot, RetryCountA/B from Scratch Register to mRootfsInfo
      mRootfsInfo.CurrentSlot = SR_RF_CURRENT_SLOT_GET (*RegisterValue);

      mRootfsInfo.RetryCountSlotA = SR_RF_RETRY_COUNT_A_GET (*RegisterValue);
      mRootfsInfo.RetryCountSlotB = SR_RF_RETRY_COUNT_B_GET (*RegisterValue);
      break;
    case FROM_VAR_TO_REG:
      // Copy CurrentSlot, RetryCountA/B from mRootfsInfo to Scratch Register
      *RegisterValue = SR_RF_CURRENT_SLOT_SET (mRootfsInfo.CurrentSlot, *RegisterValue);

      *RegisterValue = SR_RF_RETRY_COUNT_A_SET (mRootfsInfo.RetryCountSlotA, *RegisterValue);
      *RegisterValue = SR_RF_RETRY_COUNT_B_SET (mRootfsInfo.RetryCountSlotB, *RegisterValue);
      break;
    default:
      break;
  }

  return Status;
}

The above code is the source code in UEFI. I would like to know if Linux can access the register mentioned in UEFI.

8

They are stored in efi variable as I mentioned before and are configured as locked by default.
You can find the following file under /sys/firmware/efi/efivars/

RootfsRetryCountMax-781e084c-a330-417c-b678-38e696380cb9
RootfsStatusSlotA-781e084c-a330-417c-b678-38e696380cb9
RootfsStatusSlotB-781e084c-a330-417c-b678-38e696380cb9
10

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