---
name: "mstmcra"
section: "1"
platform: "linux"
package: "mstflint"
version: "4.31.0+1-4"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/mstmcra"
---

# mstmcra(1)

Mellanox Configuration Registers Access tool

## NAME

mstmcra - Mellanox Configuration Registers Access tool

## DESCRIPTION

-

  Mellanox Configuration Registers Access tool Usage: mstmcra \[-s \<i2c-slave\>\] \[-a \<adb dump\>\] \[-v\] \[-h\] \[-c\] \<device\>

-

  \<addr\[.\<bit offset\>:\<bit size\>\]\|\[,\<bytes number\>\]\> \[data\] If data is given, operation is write. Otherwise it is read. If a bit range is given in the address (E.G.: 0xf0014.16:8):

- For read

  \- Only the requested bits are printed.

-

  For write - Read-Modify-Write. Only the requested bits are changed.

-

  If 'bytes number' is given in the address (E.G.: 0xf0014,16):

- For read

  \- Will read a block (its size is the given bytes number).

-

  For write - User need to give list of dwrods to write,

-

  number of dwords should be (bytes number/4).

DESCRIPTION:

-

  Reads/writes a single word from/to a device configuration register space

**-s** \<i2c-slave\> : I2C slave address.

**-a** \<dump file\> : adb dump file, used for access by path.

- **-c**

  : clear the device's PCI semaphore.

- **-h**

  : Print this help message.

- **-v**

  : Display version info

### Environment Variables:

- ADB\_DUMP

  : Holds the path to adb dump, used for access by path (can be overridden by "-a").

## SEE ALSO

**[mstflint(1)](/mstflint/1.md)**