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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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RM0319 датащи(PDF) 36 Page - STMicroelectronics |
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RM0319 датащи(HTML) 36 Page - STMicroelectronics |
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36 / 368 page  BootROM RM0319 36/368 Doc ID 022640 Rev 3 Figure 5. Boot stages 5.3 Booting pins Refer to the datasheet for the table of Boot pin values used to select each boot mode. The values of the pins are latched at startup and are readable from the Boot_Strap_Reg described in the RAS configuration (RASCFG) chapter in RM0321: SPEAr320S address map and registers. This is the primary OS This is the third level boot code. It copies the primary OS into the SDRAM and jumps to it. BootROM X-Loader Bootloader OS After exiting the reset state, the ARM runs the BootROM code. 1. In the case of Flash booting it copies a second level boot code from Flash to the internal SRAM (shadow memory) and jumps to it. This mechanism is called ‘Code Shadowing’ 2. In case of non-Flash booting, it receives the second level boot code, executes it and then receives third level boot code and jumps to it. 3. Upgrade the Flash through USB. This is the second level boot code. It should be very small to fit into the internal SRAM (8 KB) and know the timing details of the external SDRAM. It enables SDRAM and: 1. In the case of Flash booting, it copies the third level boot code and jumps to it. 2. In case of non-Flash booting, it jumps back to BootROM. |
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