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A power-on self-test (POST) is a process performed by firmware or software routines immediately after a computer or other digital electronic device is powered on. [1] POST processes may set the initial state of the device from firmware and detect if any hardware components are non-functional.
At a minimum, if the CPU, BIOS, and the I/O interface upon which the POST card relies on are all working, a POST card can be used to monitor the system's Power-On Self Test (POST), or to diagnose problems with it.
The BIOS in older PCs initializes and tests the system hardware components (power-on self-test or POST for short), and loads a boot loader from a mass storage device which then initializes a kernel. In the era of DOS , the BIOS provided BIOS interrupt calls for the keyboard, display, storage, and other input/output (I/O) devices that ...
This memory location typically contains a jump instruction that transfers execution to the location of the firmware (UEFI or BIOS) start-up program. This program runs a power-on self-test (POST) to check and initialize required devices such as main memory , the PCI bus and the PCI devices (including running embedded option ROMs).
The PC speaker is used during the power-on self-test (POST) sequence to indicate errors during the boot process. Since it is active before the graphics card , it can be used to communicate "beep codes" related to problems that prevent the much more complex initialization of the graphics card to take place.
FPGAs, and PLAs allow POST (and BIOS) to exist as hardware. Before either one existed state machines existed in hardware. Most implemented a power-on self test -- imagine trying to debug one of these things without knowing if the machine was able to provide reliable debug information. Kernel.package 23:37, 30 September 2010 (UTC)
Download QR code; Print/export Download as PDF; Printable version; In other projects Wikimedia Commons; ... Power-on self-test; Q. Qualcomm EDL mode; QuickStart; R ...
Download QR code; Print/export Download as PDF; ... Active State Power Management; ACPI; Advanced Power Management; ... Power-on self-test; Preboot Execution ...