IBM RS/6000 7024 E Series, Руководство по обслуживанию, Страница: 106 / 162

Firmware Core
Establish Active RAM Area
1. Copy a part of the firmware code into the small amount of memory.
2. Run the firmware code now in the memory's C environment. The RAM POST will
test and configure larger amount of good memory.
3. When larger amount of memory is not found, then the hard file LED is activated
and the system is made to STOP. At this point there has been a beep and now
the hard file LED is has been lit, and the system is halted.
4. The L2 CACHE POST executes. If it passes, everything is OK. If it fails the
system does not stop, nor beep, but there is an indicator set so that when the
display is available and the RAM POST is testing the remainder of memory,
there is an icon with the 8 digit error code -- 01291000 displayed; to see where
timing of the icon appears with respect to the firmware flow -- see “Load the
Virtual Disk,” item 3g on page 6-3. If a ASCII terminal is present there is a
window with the error code.
5. Copy the compressed firmware code into the larger amount of good RAM and
uncompress.
6. Setup a new C Environment in the larger amount of good memory; a user stack,
an interrupt stack, and a debugger stack, plus a TOC pointer.
Virtual Disk
Initialize Individual Subsystems
Ÿ
Bring the VDISK Online.
Ÿ
UART initialization. If NVRAM BAD CRC error -- display with 8 digit error code
0x00016000.
Ÿ
PCI setup
Ÿ
Interrupts initialization -- interrupts are not tested. SMS program only tests RAM.
Ÿ
Real time clock initialization
Ÿ
Keyboard/Mouse controller (8042 chip) initialization
Ÿ
Password initialization
Ÿ
Debugger initialization
Load the Virtual Disk
1. Manager (system level) initialization
2. VDISK file system initialization
3. Run V: autoexec.6md (Resident Monitor) to Load all DEVICE drivers
a. video -- initialize ASCII terminal and/or VGA adapter
Ÿ
as -- Async Console Support (ASCII terminal S1 serial port)
6-2
Service Guide