Functional Description
ATCA-F140 Installation and Use (6806800M67H
)
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4.6
Boot and User Flashes
4.6.1
Boot Flash
On the ATCA-F140, two 256 Mbit NOR Flash devices are used as boot devices for the service
processor. The flash devices used will be Micron PC28F256P33BF or equivalent devices. The
data bus width to the flash devices is 16 bit, supporting word accesses only.
4.6.2
Boot Bank Selection and Reprogramming
By default, the payload processor boots from Boot Flash device #1. An IPMI OEM command can
be used to send a message to the IPMC to change the boot device. The IPMC provides an IPMI
sensor to control the signal BOOT_BANK. If the BOOT_BANK signal is set high, the payload
processor will boot from Boot Flash device #2 after reset. The boot device from which the
service processor has booted (active bank) is write protected, whereas the redundant boot
device can be erased and reprogrammed. This is to prevent inadvertent corruption of both
boot banks during firmware updates.
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