Functional Description
ATCA-F140 Installation and Use (6806800M67H)
79
For example, in order to update the firmware in both devices, the user could boot from Flash
device #1 and update Flash device #2. Then the user must switch the active boot bank and boot
from Flash device #2, which would then enable writes to Flash device #1. At this point, the
board has successfully booted the updated firmware image in Flash device #2, so it is safe to
allow the firmware update of Flash device #1.
In case of an IPMC firmware upgrade, the BOOT_BANK signal stays unchanged. After IPMC
firmware update is finished, the IPMC reads the status of BOOT_BANK before driving it again.
During debugging, it is possible to disconnect the BOOT_BANK signal driven by IPMC and
select its value by a mechanical switch setting.
Figure 4-3
Boot Bank Selection Logic
Table 4-2 Boot Bank Write Protection
BOOT
SELECT
Chip Select Mapping
Boot Device
Write Protection
Low
BOOT_FLASH_0_L = SP_CS0_L
BOOT_FLASH_1_L = SP_CS1_L
Boot Flash #1
Boot Flash #1 = Write Protected
Boot Flash #2 = Not Write Protected
High
BOOT_FLASH_0_L = SP_CS1_L
BOOT_FLASH_1_L = SP_CS0_L
Boot Flash #2
Boot Flash #1 = Not Write Protected
Boot Flash #2 = Write Protected
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Содержание 6806800M67H
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