Dynamic Reconfiguration User's Guide 2.5.1

2.1.3.1 Two types of memory and restrictions

DR memory handling classifies memory into two types: kernel memory board and non-kernel memory board.

• Kernel memory board contains kernel pages: this includes memory used by the operating system itself or the OBP program.
• Non-kernel memory board doesn't contain kernel pages at all.

DR doesn't support detaching a kernel memory board on GP7000F model 1000/2000 and PRIMEPOWER 800/1000/2000.

The system allocates kernel memory on a certain system board as much as possible. Once that board's memory is fully occupied by the kernel memory, the system selects the next candidates.

The system selects the candidate in the following order.

1. The board where OBP and OS programs are loaded (boot board). (See section 2.3.2.1 "Kernel memory allocation option")
2. The system board without no-obp-sb-cX or no-obp-sb is chosen for kernel in ascending order.
3. The system boards specified by no-obp-sb-cX or no-obp-sb (See section 2.3.2.1 "Kernel memory allocation option")
4. The system boards attached by DR. (the board attached earlier is selected)