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參數(shù)資料
| 型號： | AU1000BOOTROM_REV1 |
| 英文描述： | Mapping a Boot ROM on the AMD Alchemy? Solutions Au1000? Processor? |
| 中文描述： | 映射于AMD Alchemy 1啟動光盤？解決方案Au1000？處理器？ |
| 文件頁數(shù)： | 5/7頁 |
| 文件大?。?/td> | 46K |
| 代理商： | AU1000BOOTROM_REV1 |
Application Note
5
Mapping a Boot ROM on the Au1000 Processor
Rev. 1.2
January 2002
3.2.1 Small Boot ROMs
For boot ROMs up to 4MB in size, the mem_staddr0[CSMASK] field must be updated to reflect the size of the boot
ROM. The table below shows the value to use for CSMASK depending upon the boot ROM size.
For the small boot ROM, the Reset exception vector is at offset zero in the boot ROM and the entire boot ROM is mapped
starting at physical address 0x1FC00000.
3.2.2 Large Boot ROMs
On the Au1000, however, it is possible to utilize boot ROMs much larger than 4MB. The technique for mapping boot
ROMs larger than 4MB is this: rather than align the boot ROM to start at physical address 0x1FC00000, align the boot
ROM to end at physical address 0x1FFFFFFF. This technique is depicted below:
Figure 2: Large Boot ROMs
Table 1: Small Boot ROM CSMASK Values
Boot ROM Size
CSMASK Encoding
CSMASK Value
<= 256KB
0b11111111111111
0x3FFF
512KB
0b11111111111110
0x3FFE
1024KB (1MB)
0b11111111111100
0x3FFC
2048KB (2MB)
0b11111111111000
0x3FF8
4096KB (4MB)
0b11111111110000
0x3FF0
0x1FC00000
0x1F800000
0x00000000
0x1FC00000
0x00000000
0x1F000000
0x1E000000
0x1FC00000
0x00000000
8MB Boot ROM
0x1FFFFFFF
16MB Boot ROM
0x1FFFFFFF
32MB Boot ROM
0x1FFFFFFF
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