Emerson ATCA-S201 manual Emergency firmware recovery, theory of operation, Jumper Settings

RTM-ATCA-SXXX Overview

**

*************************************************

Erasing 256 Kibyte @ 31c0000 -- 99 % complete. Programming /dev/mtd2

Verifying rootfs.ext2.gz.uboot

Successful update of flash /dev/mtd2 from file rootfs.ext2.gz.uboot /nvdisk/mnt #

9.4Emergency firmware recovery, theory of operation

The ATCA-S201 hardware actually contains two copies of flash code. The primary image used for normal customer carrier operation, while the second image contains a backup copy preserved for emergency firmware recovery tasks. The contents of the backup flash remain fixed at time of manufacturing and there is no end-user mechanism to modify its contents. This ensures the device is not accidentally re- written or erased. A jumper on the ATCA blade is used to instruct the CPU to boot either the primary flash (normal) or the secondary flash (emergency recovery).

9.4.1Jumper Settings

The ATCA-S201 carrier board includes jumpers that are used for special recovery and reset procedures. Jumper locations are shown in Figure 30. Jumpers create an electrical connection between two pins which can be sensed by circuitry on ATCA- S201 to enter special service modes or behavior. Pin 1 is identified with a square solder pad on the printed circuit board. Jumper behavior is described below.

Table 37 JP1, jumper for primary/recovery Flash selection

JP1	Jumper	Description
	Setting
	Short Pin 1-2	Normal setting. When in this position, the jumper indicates
		that boot is loaded from the primary flash device.
	Short Pin 2-3	Service setting. When in this position, the jumper indicates
		that boot code is loaded from the secondary flash device.
Table 38 JP2, jumper for clearing master password
JP2	Jumper	Description
	Setting
	Short Pin 1-2	Normal setting. When in this position, the jumper indicates
		the master password is preserved in flash.
	Short Pin 2-3	Service setting. When in this position, the jumper indicates
		the master password shall be cleared.

6806800H62B ATCA‐S201 Installation and Use Guide 101