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The boot code in the BCM7252/BCM7444 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 a SDHC/SDXC flash card or a USB mass-storage device. 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
The 4K1142 contains six banks of DDR SDRAM (two 4GB banks and four 2GB banks), while the 4K242 and 4K1042 each contain four banks of DDR SDRAM (two 2GB banks and two 4GB banks). When the CPU 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 1067MHz, with a data rate of 2133MT/s.
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The audio output is fed through an 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 (Pwr) | Displays when the board is powered up and not in reset mode. | |
Green file-system activity (Bsy) | Flashes any time there is file-system activity (on any storage device) | |
Green MicroSD activity (µSD) | Displays when a MicroSD card is present. | |
Green network activity (Svr) | Displays when the player is connected to the BrightSign Network. | |
Green Ethernet activity (Eth) | 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 (Upd) | Flashes when the board is being upgraded. | |
Red status (Err) | 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. | |
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-Board Switch
The on-board switch is connected to the GPIO12, which is pulled low when the service (SVC) button is pressed. Conversely, a pull-up on the button normally sets the GPIO12 to be pulled high.
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The USB 2.0/3.0 high-speed host controller is implemented internally on the BCM7252/BCM7444 SOC. The board utilizes over-current protected switches that can be used to turn the power to USB devices on or off or to detect over-current situations.