System and method for providing instant video in an information handling system
View Patent ↗Before initializing a memory of an information handling system, a method includes loading an image of a video option ROM code for a graphics interface device to a cache associated with a processor of the information handling system, and executing the video option ROM code to initialize the graphics interface device. The method also includes executing a memory reference code to initialize the memory, and while executing the memory reference code, providing status information from the graphics interface device.
1. A method comprising:
prior to initializing a memory of an information handling system:
loading an image of a video option read-only memory (ROM) code to a cache, wherein the video option ROM is for a graphics interface device of the information handling system and the cache is associated with a processor of the information handling system, and wherein the image of the video option ROM code is loaded from a basic input/output (BIOS) ROM device associated with the information handling system;
executing by the processor the video option ROM code to initialize the graphics interface, wherein executing the video option ROM code further comprises:
fetching instructions of the video option ROM code from the video option ROM device; and
executing write instructions of the BIOS ROM code to the cache; and
executing a memory reference code to initialize the memory.
2. The method of claim 1 , further comprising loading a basic input/output system data area to the cache prior to initializing the memory.
3. The method of claim 1 , further comprising loading a vector table to the cache prior to initializing the memory.
4. The method of claim 1 , wherein the image of the video option ROM code is loaded to the BIOS ROM device from an option ROM device associated with the graphics interface device.
5. The method of claim 1 , wherein further the video option ROM code includes instructions to read from a memory location, the memory location being within a block of the cache that includes the image of the video option ROM code.
6. The method of claim 1 , further comprising:
comparing the video option ROM code from before the execution with the video option ROM code from after the execution to determine a location within the video option ROM code that is a data storage location; and
finding an instruction within the video option ROM code that accesses the data storage location.
7. The method of claim 6 , further comprising:
modifying the video option ROM code such that the instruction accesses a different storage.
8. An information handling system, comprising:
a processor including a cache, the cache operable in a cache-as-RAM mode;
a graphics interface including video option read only memory (ROM) code;
a basic input/output system (BIOS) ROM device including the video option ROM code; and
a memory;
wherein the processor is configured to:
set the cache to the cache-as-RAM mode;
store an image of the video option ROM code from the BIOS ROM device;
execute video option ROM code to initialize the graphics interface, wherein in executing the video option ROM code, the processor operates to:
fetch the video option ROM code from the cache; and
execute write instructions of the video option ROM code to the BIOS ROM device; and
execute a memory reference code to initialize the memory after the graphics interface is initialized.
9. The information handling system of claim 8 , wherein the processor is further configured to:
load a basic input/output system data area to the cache prior to initializing the memory.
10. The information handling system of claim 8 , further comprising loading a vector table to the cache prior to initializing the memory.
11. The information handling system of claim 8 , wherein the image of the video option ROM code is loaded to the BIOS ROM device from an option ROM device associated with the graphics interface device.
12. The information handling system of claim 8 , wherein further the video option ROM code includes instructions to read from a memory location, the memory location being within a block of the cache that includes the image of the video option ROM code.
13. The information handling system of claim 8 , wherein the processor is further configured to:
compare the video option ROM code from before the execution with the video option ROM code from after the execution to determine a location within the video option ROM code that is a data storage location; and
find an instruction within the video option ROM code that accesses the data storage location.
14. The information handling system of claim 13 , wherein the processor is further configured to:
modify the video option ROM code such that the instruction accesses a different storage.
15. A non-transitory computer readable medium including code for performing a method, the method comprising:
prior to initializing a memory of an information handling system:
loading an image of a video option read-only memory (ROM) code to a cache, wherein the video option ROM is for a graphics interface device of the information handling system and the cache is associated with a processor of the information handling system, and wherein the image of the video option RUM code is loaded from a basic input/output (BIOS) ROM device associated with the information handling system;
executing by the processor the video option ROM code to initialize the graphics interface, wherein executing the video option ROM code further comprises:
fetching instructions of the video option RUM code from the video option RUM device; and
executing write instructions of the BIOS ROM code to the cache; and
executing a memory reference code to initialize the memory.
16. The computer readable medium of claim 15 , the method further comprising:
loading a basic input/output system data area to the cache prior to initializing the memory.
17. The computer readable medium of claim 15 , the method further comprising:
loading a vector table to the cache prior to initializing the memory.
18. The computer readable medium of claim 15 , wherein the image of the video option ROM code is loaded to the BIOS ROM device from an option ROM device associated with the graphics interface device.
19. The computer readable medium of claim 15 , wherein further the video option ROM code includes instructions to read from a memory location, the memory location being within a block of the cache that includes the image of the video option ROM code.
20. The computer readable medium of claim 15 , the method further comprising:
comparing the video option ROM code from before the execution with the video option ROM code from after the execution to determine a location within the video option ROM code that is a data storage location;
finding an instruction within the video option ROM code that accesses the data storage location; and
modifying the video option ROM code such that the instruction accesses a different storage.