Difference between revisions of "J-Link flash programming"
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= Verification methods = |
= Verification methods = |
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| + | There are different verification methods and levels of verification available for J-Link. In the following, the available configurations are explained |
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| − | TBD |
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| + | |||
| + | == L1-verify == |
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| + | |||
| + | The level-1 verification is is performed immediately after programming a chunk of data into flash. Due to necessary handling for some modern MCUs (read not allowed in certain states), it was superceded by L2 verification. It is therefore deprecated and only rarely used. |
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| + | |||
| + | == L2-verify == |
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| + | The level-2 verification is performed after all data has been programmed. It is performed over all data that has been programmed. The L2-verify can be configured to be performed via different methods which are explained in the following: |
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| + | |||
| + | * Read-back: The data is read back and compared against the data that was programmed |
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| + | * CRC: A CRC over the data in flash is calculated by the flash algo and this CRC is sent back to the PC software to compare it against the CRC of the data to be programmed. This way of verification is much faster than "read-back" because not all data from flash must be transmitted over the debug interface and USB / IP to the PC for comparison. |
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| + | '''Note:''' CRC is much faster than reading back all data and gives a very good security to detect errors. It is the default for L2-verify. |
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| + | == Configuring verification levels and methods == |
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| + | The verification levels can be enabled / disabled and the method of the L2-verify can be configured via the [[J-Link control panel | J-Link Control Panel]] |
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| + | |||
| + | The following methods are available for L2-Verify: |
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| + | |||
| + | [[File: FlashDL_ControlPanel_VerifyMethods.png]] |
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Latest revision as of 16:55, 16 May 2024
Contents
Verification methods
There are different verification methods and levels of verification available for J-Link. In the following, the available configurations are explained
L1-verify
The level-1 verification is is performed immediately after programming a chunk of data into flash. Due to necessary handling for some modern MCUs (read not allowed in certain states), it was superceded by L2 verification. It is therefore deprecated and only rarely used.
L2-verify
The level-2 verification is performed after all data has been programmed. It is performed over all data that has been programmed. The L2-verify can be configured to be performed via different methods which are explained in the following:
- Read-back: The data is read back and compared against the data that was programmed
- CRC: A CRC over the data in flash is calculated by the flash algo and this CRC is sent back to the PC software to compare it against the CRC of the data to be programmed. This way of verification is much faster than "read-back" because not all data from flash must be transmitted over the debug interface and USB / IP to the PC for comparison.
Note: CRC is much faster than reading back all data and gives a very good security to detect errors. It is the default for L2-verify.
Configuring verification levels and methods
The verification levels can be enabled / disabled and the method of the L2-verify can be configured via the J-Link Control Panel
The following methods are available for L2-Verify:
