Memory Address Allocation: configuration of config. bib

Memory Address Allocation: configuration of config. bib

Author: Lai yuping (auly) aulyp@163.com

In the embedded wince system, memory allocation is set through the config. bib file, such as allocating the video address, RAM address, and Rom address. The following describes in detail some keywords used in this file and different Address Allocation when using NK mirror or xip.

 

(1) ramimage is an image placed in ram, and the address space is not controlled by Ce. This is the region automatically copied to the memory at startup,

(2) nandimage is an image placed in flash. the space allocated here indicates the region in which the system copies it to when it calls its function, because the program cannot be run directly in flash, it is generally overlapped with the ram range, which means it is copied to ram for running. Because many programs are stored in NK. set in bib, NK Sh. In this case, if NK is placed in flash, the program will also be placed in flash. When the system wants to call it, it will be copied to ram.

(3) Ram is the address space managed by Ce, that is, the space dynamically controlled by the system.

(4) If NK is used, the image must be automatically copied to ram, so the space allocated by NK is ramimage. If the xip method is used, the xipkernel is automatically copied to the memory, and the other is first stored in flash before being copied to the memory for running. Therefore, the NK method must be set to nandimage.

Xip:

Xipkernel 80200000 00300000 ramimage

NK 80500000 01900000 nandimage

NK mode:

NK 80100000 01f00000 ramimage

 

(5) Note: If a dedicated space is reserved for a specific module, it is best not to leave this space within the ram range, otherwise, the system may dynamically allocate it to other applications.

For example, you 'd better not store the display in the ram range:

Display 80100000 00100000 Reserved

 

Example:

Xip:

# Define chain_address 81d00000

# Define chain_length 00001000

Xipkernel 80200000 00300000 ramimage

NK 80500000 01900000 nandimage

Chain $ (chain_address) $ (chain_length) Reserved

Ram 80500000 03b00000 Ram

Flash 92000000 00100000 Reserved

ARGs 80020000 00000800 Reserved

Sleep 80028000 00002000 Reserved

Edbg 80030000 00020000 Reserved

Display 80100000 00100000 Reserved

NK:

NK 80200000 01900000 ramimage

Ram 81b00000 02500000 Ram; at this time, NK and Ram cannot overlap

Flash 92000000 00100000 Reserved

; Common RAM Areas

ARGs 80020000 00000800 Reserved

Sleep 80028000 00002000 Reserved

Edbg 80030000 00020000 Reserved

Display 80100000 00100000 Reserved