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The boot code in the BCM7421 instructs it to continue the boot process by reading additional code from the onboard NAND flash, which can be updated in the field, either from the flash slots or USB mass storage. Part of the NAND flash is also used to hold non-volatile parameters. The contents of the boot flash are copied into the SDRAM. The CPU then jumps to the boot code.
SDRAM
BrightSign XD players each contain four DDR SDRAM devices. When the BCM7421 boots, it will copy the code from the NAND flash device into the SDRAM and then execute the code from the SDRAM. The SDRAM runs at a clock rate of 800MHz, with a data rate of 1600MHz.
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The audio output is fed through a TI amplifier and sent directly to the audio output jack. It can drive a 32Ω load with a 2V RMS signal.
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There are eight on-board LEDs that indicate the following:
LED | Indication | |
Green power | Displays when the board is powered up and not in reset mode. | |
Green SD activity | Flashes any time there is activity on the SD card. | |
Green MicroSD activity | Displays when a MicroSD card is present. | |
Green network activity | Displays when the player is connected to the BrightSign Network. | |
Green Ethernet activity | Flashes when the player is connecting to the network. Displays when connected. | |
Green WiFi activity | Flashes when the player is connecting to the wireless network. Displays when connected. | |
Yellow update | Flashes when the board is being upgraded. | |
Red status | Flashes a certain number of times to indicate which error is occurring. The flash codes are described below. | |
2 | Unspecified error | |
3 | Network recovery script is preparing to run on a device configured for network recovery. | |
4 | No upgrade file found | |
5 | Failed to load kernel module | |
6 | Board is not capable of running the current firmware version. | |
7 | A piece of on-board hardware is not working correctly (on firmware versions 4.1 and later). | |
8 | Problem related to the storage device (either the USB drive or SD card) | |
9 | Problem related to the registry/NAND | |
10 | The autorun script encountered a load/run error. | |
11 | WiFi-related error (mainly, WiFi not found on USB) | |
12 | Unable to find a bootable image (on firmware versions 4.0 and later) | |
On-Board Switch
The on-board switch is connected to the GPIO12. A pull-up on the button normally sets the GPIO12 to be pulled high. Conversely, the GPIO12 is pulled low when the button is pressed.
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