Power-On Self-Test (POST)

Each time you turn on the system, the Power-on Self Test (POST) is initiated. Several items are tested during POST, but is for the most part transparent to the user.

The Power-On Self Test (POST) is a BIOS procedure that boots the system, initializes and diagnoses the system components, and controls the operation of the power-on password option. If POST discovers errors in system operations at power-on, it displays error messages on screen, generates a check point code at port 80h or even halts the system if the error is fatal.

NOTE: When Post executes a task, it uses a series of preset numbers called check points to belatched atport 80h, indicating the stages it is currently running. This latch can be read and shown on a debug board.The following table describes the BIOS common tasks carried out by POST. Each task is denoted by an unique check point number. For other unique check point numbers that are not listed in the table, refer to the corresponding product service guide.

Post Checkpoints List: The list may vary accordingly depending on your BIOS

Bootblock Initialization Code Checkpoints

Checkpoint

Description

 

 

Before D0

If boot block debugger is enabled, CPU cache-as-RAM functionality is enabled at this

 

point. Stack will be enabled from this point.

 

 

D0

Early Boot Strap Processor (BSP) initialization like microcode update, frequency and other

 

CPU critical initialization. Early chipset initialization is done.

 

 

D1

Early super I/O initialization is done including RTC and keyboard controller. Serial port is

 

enabled at this point if needed for debugging. NMI is disabled. Perform keyboard controller

 

BAT test. Save power-on CPUID value in scratch CMOS. Go to flat mode with 4GB limit

 

and GA20 enabled.

 

 

D2

Verify the boot block checksum. System will hang here if checksum is bad.

 

 

D3

Disable CACHE before memory detection. Execute full memory sizing module. If memory

 

sizing module not executed, start memory refresh and do memory sizing in Boot block

 

code. Do additional chipset initialization. Re-enable CACHE. Verify that flat mode is

 

enabled.

 

 

D4

Test base 512KB memory. Adjust policies and cache first 8MB. Set stack.

 

 

D5

Bootblock code is copied from ROM to lower system memory and control is given to it.

 

BIOS now executes out of RAM. Copies compressed boot block code to memory in right

 

segments. Copies BIOS from ROM to RAM for faster access. Performs main BIOS

 

checksum and updates recovery status accordingly.

 

 

D6

Both key sequence and OEM specific method is checked to determine if BIOS recovery is

 

forced. If BIOS recovery is necessary, control flows to checkpoint E0. See Bootblock

 

Recovery Code Checkpoints section of document for more information.

 

 

D7

Restore CPUID value back into register. The Bootblock-Runtime interface module is

 

moved to system memory and control is given to it. Determine whether to execute serial

 

flash.

 

 

D8

The Runtime module is uncompressed into memory. CPUID information is stored in

 

memory.

 

 

D9

Store the Uncompressed pointer for future use in PMM. Copying Main BIOS into memory.

 

Leaves all RAM below 1MB Read-Write including E000 and F000 shadow areas but

 

closing SMRAM.

 

 

42

Chapter 4

Page 48 Page 50
Page 49
Image 49
Acer M3802(G) manual Power-On Self-Test Post, Checkpoint Description
Page 48 Page 50

M3802(G) specifications

The Acer M3802(G) is a remarkable computer that offers a blend of performance, aesthetics, and innovation suitable for both home and office environments. Designed for users seeking a reliable and efficient machine, the M3802(G) boasts features that make it stand out in a competitive market.

At the heart of the Acer M3802(G) is the powerful processor. Typically equipped with Intel's Core i5 or i7 series, it provides efficient multitasking capabilities and exceptional performance for daily tasks, gaming, and multimedia applications. This ensures smooth operation even when running resource-intensive applications, making it an ideal choice for users who demand reliability.

One of the key characteristics of the Acer M3802(G) is its robust storage options. Users can choose from various configurations, including traditional hard drives and faster solid-state drives (SSD). The inclusion of SSDs drastically improves boot times and application loading speeds, allowing users to enjoy a seamless computing experience. Furthermore, with ample storage capacity, users can store large amounts of data, from documents to high-definition media.

In terms of graphics, the Acer M3802(G) leverages integrated Intel HD Graphics or optional dedicated graphics cards. This combination offers flexibility for casual gamers and creative professionals who need accurate rendering for graphic design and video editing tasks. Whether you are playing games or editing videos, the M3802(G) delivers crisp visuals and smooth frame rates.

Connectivity is another strong suit of the Acer M3802(G). It comes equipped with multiple USB ports, HDMI output, and Ethernet options for seamless integration with various peripherals and networks. Moreover, built-in Wi-Fi and Bluetooth capabilities ensure that users can connect to the internet and other devices wirelessly with ease, enhancing the overall user experience.

The M3802(G) also features Acer’s advanced cooling technology, which maintains optimal operating temperatures during intensive tasks. This not only helps in prolonging the lifespan of components but also ensures that the system runs quietly, which is ideal for office environments or home setups where noise can be a distraction.

Additionally, the design of the Acer M3802(G) reflects a modern aesthetic, with a sleek chassis and thoughtful cable management options that allow for a tidy workspace. With its compact form factor, it fits easily in smaller areas while still delivering the power and performance expected from a full-sized desktop.

In summary, the Acer M3802(G) is a well-rounded desktop that combines powerful performance, extensive storage options, and excellent connectivity features. With its advanced cooling system, sleek design, and modern technologies, it proves to be a solid investment for anyone in need of a dependable computing solution. Whether for work or play, the M3802(G) delivers an exceptional experience tailored to the demands of today's users.
Top Page Image Contents