NXP Semiconductors S32V234-EVB2, Быстрый старт, Страница: 7 / 13

EXTERNAL USE
6
Boot configurations
•
The S32V234 has are three ‘Boot modes’:
o Serial download: Allows external tool to use CAN or UART to download
code into RAM and start execution. Code must be redownloaded on every
reset in this mode. Uses 48kbps baud rate, see S32V234 reference
manual, system boot chapter, for specifics.
o
Boot from fuses: Configures device to boot according to the internal
eFuse values programmed at factory, generally not used for evaluation
boards due to lack of custom fuse programming.
o
Boot from RCONs: the most common configuration, allows customization
of boot configuration via the 4 8-bit DIP switches on EVB2 (circled in
picture).
•
The modes are selected by ‘BOOT_MODE0/1’ signals controlled
by jumpers J40(Boot_Mode[0]) & J42(Boot_Mode[1]), and are
read at reset. By default, the EVB2 is configured to use ‘Boot
from RCONs’ mode. Refer to reference manual ‘System Boot’
chapter for more details on boot modes.
• By default, the board boots from RCON switches, which allow
choosing boot core, and SD card modes for advanced use cases.
(
Table to be provided at end of slides.)
• Using Jumpers J48 and J49, the EVB2 can be configured to boot
from SD card, EMMC, or QSPI. Booting from SD card is the
factory default setting.
• Boot from SD: J48=1&2,J49=1&2, SW8 = 0x80
• Boot from EMMC: J48=1&2, J49=2&3, SW8 = 0xC0
• Boot from QSPI: J48=2&3, SW8 = 0x01
Note: Not all configurations of switches are supported by Linux BSP.
Please refer to Linux BSP User Manual for validated modes.