Sonic Alert 2.8 user manual Das U-Boot image

5.1 Das U-Boot 12

5.1.5U-Boot Memory layout

The following diagram shows the general layout of RAM within Das U-Boot.

0xA4000000	32K segment used for page tables.
0xA3FF8000
0xA3FF7FFF	Unused RAM
0xA2000000
0xA1FFFFFF	Extra space between Das U-Boot and 32MB
	boundary
0xA1F00000+	The Das U-Boot image is loaded 1MB below
	the 32MB boundary
0xA1F00000
0xA1EFFFFF	The heap and stack are allocated in space
	preceding the U-Boot image. 1
0xA1EFFFFF-
0xA1EFFFFF-	Frame Buffer for BD-2003
0xA1EFFFFF--
0xA1EFFFFF--	Unused Low RAM
0xA0000000

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Page Tables

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Unused High

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Tail of 32MB

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Das U-Boot image

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Heap and Stack

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Frame Buffer

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Unused Low

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December 28, 2005 Revision 2.8