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Document io memory

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stefanrueger
2023-08-13 00:02:23 +01:00
parent 867b546a5e
commit f4b2f69451
2 changed files with 27 additions and 1 deletions
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15
src/avrdude.1
View File

@@ -770,6 +770,10 @@ flash-type memories the -U option can only write 0-bits but not 1-bits.
Hence, usersig needs to be erased before a file can be uploaded to this
memory region, e.g., using -T "erase usersig" -U
usersig:w:parameters.hex:i
.It io
Volatile register memory; it cannot be accessed by external programming
methods only by bootloaders, which has limited use unless the bootloader
jumps to the application directly, i.e., without a WDT reset
.El
.Pp
ATxmega devices have the following memory types in addition to eeprom, flash, signature and lock:
@@ -795,6 +799,10 @@ Production signature (calibration) area
.It usersig
Additional flash memory page that can be used for firmware settings; this
memory is not erased during a chip erase
.It io
Volatile register memory;
.Nm
can read this memory but not write to it using external programming
.El
.Pp
Modern 8-bit AVR devices have the following memory types in addition to eeprom, flash, signature and lock:
@@ -837,6 +845,13 @@ Extra page of EEPROM memory that can be used for firmware settings; this
memory is not erased during a chip erase
.It sib
Special system information block memory with information about AVR family, chip revision etc.
.It io
Volatile register memory;
.Nm
can program this memory but this is of limited utility because anything
written to the io memory will be undefined or lost after reset; writing to
individual registers in the terminal can still be used, e.g., to test I/O
ports
.El
.Pp
The

13
src/doc/avrdude.texi
View File

@@ -814,6 +814,10 @@ memories the @code{-U} option can only write 0-bits but not 1-bits.
Hence, usersig needs to be erased before a file can be uploaded to this
memory region, e.g., using @code{-T "erase usersig" -U
usersig:w:parameters.hex:i}
@item io
Volatile register memory; it cannot be accessed by external programming
methods only by bootloaders, which has limited use unless the bootloader
jumps to the application directly, i.e., without a WDT reset
@end table
ATxmega devices have the following memory types in addition to
@@ -838,6 +842,9 @@ Production signature (calibration) area
@item usersig
Additional flash memory page that can be used for firmware settings; this
memory is not erased during a chip erase
@item io
Volatile register memory; AVRDUDE can read this memory but not write to it
using external programming
@end table
Modern 8-bit AVR devices have the following memory types in addition to
@@ -880,7 +887,11 @@ Extra page of EEPROM memory that can be used for firmware settings; this
memory is not erased during a chip erase
@item sib
Special system information block memory with information about AVR family, chip revision etc.
@item io
Volatile register memory; AVRDUDE can program this memory but this is of
limited utility because anything written to the io memory will be undefined or
lost after reset; writing to individual registers in the terminal can
still be used, e.g., to test I/O ports
@end table
The @var{op} field specifies what operation to perform: