mwr

Memory Write.

Syntax

mwr [options] <address> <values> [num]

Write <num> data values from list of <values> to active target memory address specified by <address>. If <num> is not specified, all the <values> from the list are written sequentially from the address specifed by <address> If <num> is greater than the size of the <values> list, the last word in the list is filled at the remaining address locations.

mwr [options] -bin -file <file-name> <address> [num]

Read <num> data values from a binary file and write to active target memory address specified by <address>. If <num> is not specified, all the data from the file is written sequentially from the address specifed by <address>.

Options

Option Description
-force Overwrite access protection. By default accesses to reserved and invalid address ranges are blocked.
-bypass-cache-sync Do not flush/invalidate CPU caches during memory write. Without this option, debugger flushes/invalidates caches to make sure caches are in sync.
-size <access-size> <access-size> can be one of the values below: b = Bytes accesses h = Half-word accesses w = Word accesses d = Double-word accesses Default access size is w. Address will be aligned to accesss-size before writing to memory, if '-unaligned-access' option is not used. If target does not support double-word access, the debugger uses 2 word accesses. If number of data values to be written is more than 1, then debugger selects appropriate access size. For example, 1. mwr -size b 0x0 {0x0 0x13 0x45 0x56} Debugger writes one word to the memory, combining 4 bytes. 2. mwr -size b 0x0 {0x0 0x13 0x45} Debugger writes one half-word and one byte to the memory, combining the 3 bytes. 3. mwr 0x0 {0x0 0x13 0x45} Debugger writes 3 words to the memory.
-bin Read binary data from a file and write it to target address space.
-file <file-name> File from which binary data is read to write to target address space.
-address-space <name> Access specified memory space instead default memory space of current target. For Arm DAP targets, address spaces DPR, APR and AP<n> can be used to access DP Registers, AP Registers and MEM-AP addresses, respectively. For backwards compatibility -arm-dap and -arm-ap options can be used as shorthand for "-address-space APR" and "-address-space AP<n>", respectively. The APR address range is 0x0 - 0xfffc, where the higher 8 bits select an AP and lower 8 bits are the register address for that AP.
-unaligned-accesses Memory address is not aligned to access size, before performing a write operation. Support for unaligned accesses is target architecture dependent. If this option is not specified, addresses are automatically aligned to access size.

Note(s)

  • Select a APU target to access Arm DAP and MEM-AP address space.

Returns

Nothing, if successful. Error string, if the target memory cannot be written.

Example(s)

mwr 0x0 0x1234

Write 0x1234 to address 0x0.

mwr 0x0 {0x12 0x23 0x34 0x45}

Write 4 words from the list of values to address 0x0.

mwr 0x0 {0x12 0x23 0x34 0x45} 10

Write 4 words from the list of values to address 0x0 and fill the last word from the list at remaining 6 address locations.

mwr -size b 0x1 {0x1 0x2 0x3} 3

write 3 bytes from the list at address 0x1.

mwr -size h 0x2 {0x1234 0x5678} 2

write 2 half-words from the list at address 0x2.

mwr -bin -file mem.bin 0 100

Read 100 words from binary file mem.bin and write the data at target address 0x0.

mwr -arm-dap 0x100 0x80000042

Write 0x80000042 to APB-AP CSW on Zynq The higher 8 bits (0x1) select the APB-AP and lower 8 bits (0x0) is the address of CSW.

mwr -arm-dap 0x04 0xf8000120

Write 0xf8000120 to AHB-AP TAR on Zynq The higher 8 bits (0x0) select the AHB-AP and lower 8 bits (0x4) is the address of TAR.

mwr -arm-ap 1 0x80090088 0x03186003

Write 0x03186003 to address 0x80090088 on DAP APB-AP 0x80090088 corresponds to DBGDSCR register of Cortex-A9#0, on Zynq AP 1 selects the APB-AP.

mwr -arm-ap 0 0xe000d000 0x80020001

Write 0x80020001 to address 0xe000d000 on DAP AHB-AP 0xe000d000 corresponds to QSPI device on Zynq AP 0 selects the AHB-AP.