RM0319 datasheet(35/368 Pages) STMICROELECTRONICS

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RM0319

BootROM

Doc ID 022640 Rev 3

35/368

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)

●

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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