SPRABA5D January 2014 – January 2019 AM1802 , AM1802 , AM1806 , AM1806 , AM1808 , AM1808 , AM1810 , AM1810
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Using the AM18xx Bootloader
- Trademarks
- 1 Introduction
- 2 Boot Modes
- 3 Non-AIS Boot Modes
- 4
Application Image Script (AIS) Boot
- 4.1 Section Load Command (0x58535901)
- 4.2 Section Fill Command (0x5853590A)
- 4.3 Enable CRC Command (0x58535903)
- 4.4 Disable CRC Command (0x58535904)
- 4.5 Validate CRC Command (0x58535902)
- 4.6 Jump & Close Command (0x58535906)
- 4.7 Jump Command (0x58535905)
- 4.8 Sequential Read Enable Command (0x58535963)
- 4.9 Function Execute Command (0x5853590D)
- 4.10 Boot Table Command (0x58535907)
- 5
AISgen: Tool to Generate Boot Script (AIS Image)
- 5.1 Installation
- 5.2 Getting Started
- 5.3
Generating AIS
- 5.3.1 Boot Mode and Boot Peripheral Setup
- 5.3.2 Phase-Locked Loop (PLL) Setup
- 5.3.3 Synchronous Dynamic Random Access Memory (SDRAM) Setup
- 5.3.4 DDR Setup
- 5.3.5 PSC Setup
- 5.3.6 Pin Multiplexing Setup
- 5.3.7 Application File Selection
- 5.3.8 AIS File Selection
- 5.3.9 Status and Messages
- 5.3.10 Additional AIS Options
- 5.3.11 Command Line Usage
- 6 Master Boot – Booting From a Slave Memory Device
- 7 Slave Boot – Booting From an External Master Host
- 8 UART Boot Host - Using Your PC as a UART Boot Master
- 9 Boot Requirements, Constraints and Default Settings
- 10 References
- A Boot Mode Selection Table
- B Details of Supported NAND Devices
- C CRC Computation Algorithm
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D Details of Pre-Defined ROM Functions
- D.1 PLL0 Configuration (Index = 0, Argument Count = 2)
- D.2 PLL1 Configuration (Index = 1, Argument Count = 2)
- D.3 Clock Configuration (Index = 2, Argument Count = 1)
- D.4 mDDR/DDR2 Controller Configuration (Index = 3, Argument Count = 8)
- D.5 EMIFA SDRAM Configuration (Index = 4, Argument Count = 5)
- D.6 EMIFA Async Configuration (Index = 5, Argument Count = 5)
- D.7 PLL and Clock Configuration (Index = 6, Argument Count = 3)
- D.8 Power and Sleep Configuration (PSC) (Index = 7, Argument Count = 1)
- D.9 Pinmux Configuration (Index = 8, Argument Count = 3)
- E ROM Revision History
- Revision History
7.3 Ping Op-Code Synchronization (POS)
The POS is used to further ensure that the serial link between the host and the device is reliable for exchanging boot information.
After successful SWS:
- The host sends the PING_DEVICE (0x5853590B) op-code to the bootloader and receives the RECV_PING_DEVICE (0x5253590B) as acknowledgment from the bootloader.
- The host sends an arbitrary 32-bit number (N) to the bootloader and gets back the same number (N) from the bootloader.
- The host counts from 1 to N, sending each number to the bootloader and receiving the same number in response. Each number sent or received is a 32-bit value.
NOTE
All multi-word values transmitted by the host should be sent in little-endian order. For instance, the Ping opcode (0x5853590B) is sent as 0x0B, 0x59, 0x53, 0x58 in 8-bit mode or 0x590B, 0x5853 in 16-bit mode. The same applies to responses received from the bootloader.
The count (N) is selected by the host (OEM) and should be appropriate to assure successful communication between the device and host. The recommended value of N is 2.
Figure 23 shows the flowchart of how the POS should be implemented on the host:
Figure 23. Flowchart: Ping Op-Code Synchronization After the successful execution of POS, the host starts reading AIS commands (magic number is checked and ignored by the host) from its source and starts booting the device.