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Wiki > Main > IaudioPort > IaudioX5Info > IaudioX5FirmwareDisassembly

---+!! Information gathered from iaudio X5 OF disassembly

%TOC%

---++ Preloader
---+++ General Info
This part of firmware resides from 0x00000000 to 0x00010000 and never changes.
It is a single-threaded program that handles the following tasks:
   1 Device initialization.
   2 USB HDD mode.
   3 Adapter/USB charge mode.
   4 Firmware upgrade.
   5 Executing the actual firmware (i.e., jmp 0x10000).

---+++ General Code Flow
   * Initialization steps 1 & 2
   * If USB and/or AC adapter is connected, go to Initialization step 3; otherwise, go to Initialization step 4.

---++++ Initialization, step 1
   * Internal <nop>ColdFire registers: sp, vbr, cacr, acr0, acr1, mbar, mbar2, rambar0, rambar1
   * Various registers on MBAR and MBAR2 (interrupts, timers, DMA, IIS_CONFIGs, EBU_CONFIGs)
   * GPIO out/enable/function registers
      | | *OUT* | *ENABLE* | *FUNCTION* |
      | *GPIO* | 0x40200018 | 0x60A0E018 | 0x6FA1E179 |
      | *GPIO1* | 0x4830 | 0x483C | 0x483C|
   * DRAM controller
   * PLL_CONFIG (to 0x11436059)
   * Chip Select 0
   * Copy rest of preloader to DRAM

---++++ Initialization, step 2
   * UART0
   * LCD
   * I2C controller (interface 1 only)
   * PCF50606
   * CY7C68310

---++++ Initialization, step 3 (USB and/or AC adapter connected)
   * Remote LCD detect & init
   * Turn of backlight and display boot screen
   * If USB is connected:
      * ATA init & reset
      * HDD identify & init
      * Partition table & FAT32 init
      * Set slow CPU freq (PLL_CONFIG = 0x10422035) and adjust UART divider (32)
      * Enter ATA bridge mode
   * If AC adapter is connected:
      * ATA init & reset
      * HDD identify & init
      * Partition table & FAT32 init

---++++ Initialization, step 4 (neither USB nor AC adapter connected)
   * ATA init & reset
   * Jump to firmware (at 0x10000)

_To be continued..._

---++ Firmware
---+++ General Info
This part of firmware resides from 0x00010000 to ~0x019D0000 and can be upgraded.

It has two parts:
   * the first is composed of ~18 data and/or code segments, most of which are cached to IRAM/DRAM.
   * the second contains read-only data (images, remote images, text strings, ...) and begins at 0x01700000. H3Mod changes things here.

_To be continued..._

r3 - 30 Sep 2007 - 17:32:14 - NicolasPennequin

Parents: IaudioPort > IaudioX5Info