CPC1001
C P C 1 0 0 1 U s e r M a n u a l
29
© 2 0 2 1 F a s t w e l V e r . 0 0 1
Table 2.2
– Boot sources of CPC1001
BOOT_SEL[2…0]#
OS boot source
000
SATA on the carrier board
001
SD card on the carrier board
(µSDHC2)
010
eMMC Flash on the carrier board
(µSDHC3)
011
SPI Flash on the carrier board (SPI0_CS1#)
EIM_D19 ALT1 ECSPI1_SS1 or ALT5
GPIO3_IO19
100
MMC-card on the carrier board
(µSDHC2)
101
Serial Boot (USB_OTG)
110
Onboard
eMMC Flash (µSDHC4)
111
Onboard SPI Flash (SPI0_CS0#)
EIM_EB2 ALT1 ECSPI1_SS0 or ALT5
GPIO2_IO30
BOOT_SEL [2… 0] # signals in CPC1001 have a pull-up, which ensures a high signal level (“1”)
where there are no external connections. To set the low level of signal
(“0”), the relevant circuit on
the carrier board must be grounded. The state of the BOOT_SEL [2 ... 0]# signals is considered
only at the time of the end of the CPC1001 hardware reset signal, therefore the selected source
will be saved during any further reboots initiated by the operating system or when the watchdog
timer is triggered.
For rebooting from the sources located on the carrier board, the corresponding devices must be
supplied with power by the time the boot starts. That is, it should not depend on the
CARRIER_PWR_ON and CARRIER_STBY# signals. The SDIO_PWR_EN signal, however,
can
be used to control power to the SD card on the carrier board.
2.7 Power up and down
The power is fed via the SMARC connector (subparagraph 1.6.2). Requirements to the supply
voltages of CPC1001 are given in Table 2.3.