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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) 35 Page - STMicroelectronics |
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RM0319 датащи(HTML) 35 Page - STMicroelectronics |
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35 / 368 page  RM0319 BootROM Doc ID 022640 Rev 3 35/368 5 BootROM This chapter focuses on Boot ROM functionality and operation; BootROM is a small piece of code that starts its execution just after the SoC exits from reset. 5.1 Boot modes ● Boot from NOR serial Flash ● Boot from NAND Flash ● Boot from NOR parallel Flash ● Boot / Upgrade from USB ● Boot from UART0 ● Boot from Ethernet (MII0) ● Boot ROM Bypass The first three modes are the normal ways of booting the software and require a second- level boot software (X-Loader) in NOR/NAND Flash. USB Boot is meant to boot without Flash memories. It is used to upgrade 1st to 3rd level boot in Flash memories. . 5.2 Boot stages Figure 5 describes boot stages on SPEAr320S in more details. There are 4 stages of booting: ● Boot stage 1 (BootROM) ● Boot stage 2 (X-Loader) ● Boot stage 3 (Bootloader e.g. U-Boot) ● OS Table 7. Booting types Booting using Flash memories Upgrading the Flash memories Serial NOR USB Parallel NOR Ethernet I2C boot mode Parallel NAND Ethernet SPI boot mode UART0 BootROM Bypass |
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