Displaying pre-boot error messages

1. A method comprising:

determining, by an embedded controller of a computing device, that a power-on has been initiated;

determining, by the embedded controller, that a particular component of a plurality of components of the computing device has an issue that prevents a normal boot of a basic input output system (BIOS) of the computing device; and

only upon determining that the particular component has the issue, then:

sending a message from the embedded controller to a timing controller of a display panel, the message instructing the timing controller to access a data structure on a non-volatile storage and select one or more error or warning message data items_associated with the particular component or a system state from multiple different data items stored in the data structure,

in the timing controller, responding to the message from the embedded controller by:

accessing the non-volatile storage from the timing controller to select and retrieve the one or more error or warning message data items from the data structure,

assembling multiple separate data items into a composite bitmapped image, wherein the multiple separate data items include a logo and the one or more error or warning message data items retrieved from the data structure, and

displaying, on a display area of the display panel, the composite bitmapped image; and

only upon determining that the particular component does not have the issue, then in the timing controller:

accessing the non-volatile storage to select and retrieve one or more other data items from the data structure, and

displaying, on the display area of the display panel, a different image from the composite bitmapped image, the different image comprising the one or more other data items retrieved from the data structure and not comprising the one or more error or warning message data items;

wherein a display device connected to the computing device comprises the display panel and the timing controller.

2. The method of claim 1 , further comprising:

determining a status of individual components of the plurality of components, wherein the plurality of components comprise a central processing unit (CPU), a random access memory (RAM), a battery connected to the computing device, a power adapter connected to the computing device, the BIOS, and a storage device connected to the computing device.

3. The method of claim 1 , wherein the composite bitmapped image comprises a small logo that occupies only a portion of the display area and that is assembled together with the one or more error or warning message data items positioned in a remaining portion of the display area that is not occupied by the small logo; and where the different image comprises a large logo without the one or more error or warning message data items, the large logo sized to occupy at least a portion of the display area that is not occupied by the small logo.

4. The method of claim 1 , wherein the timing controller further responding to the message from the embedded controller by:

copying the one or more error or warning message data items from a flash memory that is accessible to the timing controller to create the composite bitmapped image; and

transferring the composite bitmapped image via direct memory access to a frame buffer associated with the display panel.

5. The method of claim 3 , further comprising:

determining whether or not the issue that prevented booting the BIOS of the computing device is present; and

only upon determining that the issue that prevented booting the BIOS of the computing device is not present, then performing the following:

initiating the booting of the BIOS, and

sending a second message from the embedded controller to the timing controller, the second message causing the timing controller to display, on the display panel, the different image comprising the large logo without the one or more error or warning message data items.

6. The method of claim 5 , further comprising:

receiving an instruction from a video source of the computing device that the video source is available; and

sending a third message from the embedded controller to the timing controller, the third message instructing the timing controller to display, on the display panel, an output of the video source.

7. The method of claim 6 , wherein the video source comprises an embedded display port (eDP) or a mobile industry processor interface (MIPI) display serial interface (DSI).

8. A computing device comprising:

a plurality of components comprising one or more processors;

an embedded controller;

a read-only memory (ROM) to store a basic input output system (BIOS);

wherein the embedded controller is configured with instructions to, before the one or more processors begin to execute:

determine that a power-on has been initiated;

determine that a particular component of the plurality of components of the computing device has an issue that prevents booting the BIOS; and

only upon determining that the particular component has the issue, then:

send a first message from the embedded controller to a timing controller of a display panel, the first message instructing the timing controller to access a data structure on a non-volatile storage and select multiple separate data item images including the one or more error or warning message data items_associated with the particular component or a system state from multiple different data items stored in the data structure;

assemble a composite bitmapped image that includes a logo and the one or more error or warning message data items selected from the data structure, and

display, on a display area of the display panel, the custom composite bitmapped image; and

only upon determining that the particular component does not have the issue, then send a second message from the embedded controller to the timing controller of the display panel to cause the timing controller to:

access the non-volatile storage to select and retrieve one or more other data items from the data structure, and

display, on the display area of the display panel, a different image from the composite bitmapped image, the different image comprising the one or more of the other data items retrieved from the data structure and not comprising the one or more error or warning message data items;

wherein a display device connected to the computing device comprises the display panel and the timing controller.

9. The computing device of claim 8 , wherein the plurality of components comprise a central processing unit (CPU), a random access memory (RAM), a battery connected to the computing device, a power adapter connected to the computing device, and a storage device connected to the computing device.

10. The computing device of claim 8 , wherein:

the first message further instructs the timing controller to display a logo, an icon, a quick response (QR) code, or another graphics image on the display panel; and

the first message is compliant with an I2C protocol.

11. The computing device of claim 8 , wherein the one or more error messages comprise text indicating at least one of:

a power adapter is not connected to the computing device;

the power adapter is incompatible with the computing device;

the power adapter is inadequate for a power usage of the computing device;

the battery is not present;

a request to connect the battery;

a charge level of the battery is below a predetermined level;

the battery is being charged;

a boot process will initiate after the charge level is equal to or above the predetermined level;

a boot process will take longer than normal;

a bootable image was not found on one or more storage devices connected to the computing device;

a processor error associated with a central processing unit (CPU) occurred;

a memory error associated with a random-access memory (RAM) of the computing device occurred;

a ROM error associated with the ROM occurred; or

an error code associated with a particular component of the plurality of components.

12. The computing device of claim 8 , where the composite bitmapped image further comprises a small logo that occupies only a portion of the display area and that is assembled together with the one or more error or warning message data items positioned in a remaining portion of the display area that is not occupied by the small logo; and wherein the different image comprises a large logo without the one or more error or warning message data items, the large logo sized to occupy at least a portion of the display area that is not occupied by the small logo; and wherein the embedded controller is further configured to:

determine whether or not there are zero issues preventing booting the BIOS; and

perform the following only upon determining that that there are zero issues preventing booting the BIOS:

initiate the booting of the BIOS, and

send the second message from the embedded controller to the timing controller, the second message causing the timing controller to display, on the display panel, the different image comprising the large logo without the one or more error or warning message data items.

13. The computing device of claim 12 , wherein the embedded controller is further configured to:

receive an instruction from a peripheral control hub (PCH) of the computing device that a video signal is available; and

send a third message from the embedded controller to the timing controller, the third message instructing the timing controller to display, on the display panel, the video signal.

14. The computing device of claim 8 , wherein the embedded controller is further configured to:

determine a status of a battery of the computing device using data provided by a battery management unit of the computing device.

15. One or more non-transitory computer readable media storing instructions executable by an embedded controller to:

determine that a power-on has been initiated;

determine that a particular component of the plurality of components of the computing device has an issue that prevents booting the BIOS; and

only upon determining that the particular component has the issue, then:

send a first message from the embedded controller to a timing controller of a display panel, the first message instructing the timing controller to access a data structure on a non-volatile storage and select multiple separate data item images including one or more error or warning message data items_associated with the particular component or a system state from multiple different data items stored in the data structure;

assemble a composite bitmapped image that includes a logo and the selected one or more error or warning message data items from the data structure, and

display, on a display area of the display panel, the composite bitmapped image; and

only upon determining that the particular component does not have the issue, then send a second message from the embedded controller to the timing controller of the display panel to cause the timing controller to:

access the non-volatile storage to select and retrieve one or more other data items from the data structure, and

display, on the display area of the display panel, a different image from the composite bitmapped image, the different image comprising the one or more other data items retrieved from the data structure and not comprising the one or more error or warning message data items;

wherein a display device connected to the computing device comprises the display panel and the timing controller.

16. The one or more non-transitory computer readable media of claim 15 , wherein the instructions are further executable by the embedded controller to:

determine a status of individual components of the plurality of components, wherein the plurality of components comprise a central processing unit (CPU), a random access memory (RAM), a battery connected to the computing device, a power adapter connected to the computing device, the BIOS, and a storage device connected to the computing device.

17. The one or more non-transitory computer readable media of claim 15 , wherein the composite bitmapped image further comprises a small logo that occupies only a portion of the display area and that is assembled together with the one or more error or warning message data items positioned in a remaining portion of the display area that is not occupied by the small logo; and wherein the different image comprises a large logo without the one or more error or warning message data items, the large logo sized to occupy at least a portion of the display area that is not occupied by the small logo.

18. The one or more non-transitory computer readable media of claim 15 , wherein:

the one or more error message data items are copied by a timing controller of a display panel from a flash memory of the timing controller to create the composite bitmapped image; and

the composite bitmapped image is transferred, by the timing controller using direct memory access, to a frame buffer associated with the display panel.

19. The one or more non-transitory computer readable media of claim 17 , wherein the instructions are further executable by the embedded controller to:

determine whether or not the issue that prevented booting the BIOS of the computing device is resolved;

determine whether or not any issues prevent booting of the BIOS; and

only upon determining that the issue that prevented booting the BIOS of the computing device is resolved and that no issues prevent booting of the BIOS, then:

initiate the booting of the BIOS, and

send the second message from the embedded controller to the timing controller, the second message causing the timing controller to display, on the display panel, the different image comprising the large logo without the one or more error or warning message data items.

20. The one or more non-transitory computer readable media of claim 15 , wherein the instructions are further executable by the embedded controller to:

receive an instruction from the computing device that a video signal is available; and

send a third message from the embedded controller to the timing controller, the third message instructing the timing controller to display, on the display panel, the video signal.