Segger J-Link User Manual page 176

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0x40008000-0x7FCFFFFF
0x7FD00000-0x7FD01FFF
0x7FD02000-0x7FD02000
0x7FFFD000-0x7FFFFFFF
0x80000000-0xDFFFFFFF
0xE0000000-0xEFFFFFFF
0xF0000000-0xFFFFFFFF
The "problematic" memory areas are:
0x00080000-0x3FFFFFFF
0x40008000-0x7FCFFFFF
0x7FD02000-0x7FD02000
0x80000000-0xDFFFFFFF
To exclude these areas from being accessed through J-Link the map exclude com-
mand should be used as follows:
map exclude 0x00080000-0x3FFFFFFF
map exclude 0x40008000-0x7FCFFFFF
map exclude 0x7FD02000-0x7FD02000
map exclude 0x80000000-0xDFFFFFFF
5.11.1.5 map indirectread
This command can be used to read a memory area indirectly. Indirectly reading
means that a small code snippet is downloaded into RAM of the target device, which
reads and transfers the data of the specified memory area to the host. Before map
indirectread can be called a RAM area for the indirectly read code snippet has to be
defined. Use therefor the map ram command and define a RAM area with a size of >=
256 byte.
Typical applications
Refer to chapter Fast GPIO bug on page 256 for an example.
Syntax
map indirectread <StartAddressOfArea>-<EndAddress>
Example
map indirectread 0x3fffc000-0x3fffcfff
5.11.1.6 map ram
This command should be used to define an area in RAM of the target device. The area
must be 256-byte aligned. The data which was located in the defined area will not be
corrupted. Data which resides in the defined RAM area is saved and will be restored if
necessary. This command has to be executed before map
called.
Typical applications
Refer to chapter Fast GPIO bug on page 256 for an example.
Syntax
map ram <StartAddressOfArea>-<EndAddressOfArea>
Example
map ram 0x40000000-0x40003fff;
J-Link / J-Trace (UM08001)
CHAPTER 5
Reserved
On-chip USB DMA RAM
Reserved
Boot block (remapped from on-chip flash memory)
Reserved
VPB peripherals
AHB peripherals
Reserved
Reserved
Reserved
Reserved
© 2004-2013 SEGGER Microcontroller GmbH & Co. KG
Working with J-Link and J-Trace
indirectread will be