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
4 Application Image Script (AIS) Boot
AIS is a format of storing the boot image. Apart from the HPI and two NOR-boot modes described above, all boot modes supported by the AM18xx bootloader use AIS for boot purposes.
AIS is a binary language, accessed in terms of 32-bit (4-byte) words in little endian format. AIS starts with a magic word (0x41504954) and contains a series of AIS commands, which are executed by the bootloader in sequential manner. The Jump & Close (J&C) command marks the end of AIS.
Figure 4. Structure of AIS Each AIS command consists of an opcode, optionally followed by one or more arguments, followed by optional data.
Figure 5. Structure of an AIS Command The opcode and its arguments are each one word (4 bytes) wide. If the length of data is not a multiple of 4 bytes, it is padded with zeros to make it so.
Knowledge of AIS commands is not required to use the bootloader, but will be discussed in the following sub-sections for completeness. You can skip to the next section if knowledge of AIS commands is not desired.