TMS320DM355 datasheet(83/153 Pages) TI

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3.12.1 Boot Modes Overview

TMS320DM355

Digital Media System-on-Chip (DMSoC)

SPRS463 – SEPTEMBER 2007

The boot selection pins (BTSEL[1:0]) determine the ARM boot process. After reset (POR, warm reset, or

max reset), ARM program execution begins in ARM ROM at 0x0000: 8000, except when BTSEL[1:0] = 01,

indicating AEMIF (AEMIF/OneNand) boot. See Section 3.11.1 for information on the boot selection pins.

DM355’s ARM ROM boot loader (RBL) executes when the BOOTSEL[1:0] pins indicate a condition other

than the normal ARM EMIF boot.

• If BTSEL[1:0] = 01 - Asynchronous EMIF (AEMIF or NOR Flash) boot. This mode is handled by

hardware control and does not involve the ROM. In the case of OneNAND, the user is responsible for

putting any necessary boot code in the OneNAND's boot page. This code shall configure the AEMIF

module for the OneNAND device. After the AEMIF module is configured, booting will continue

immediately after the OneNAND’s boot page with the AEMIF module managing pages thereafter.

Furthermore, in case of Fast Boot from AEMIF/OneNAND, the user is responsible for checking the

state of the FASTBOOT bit in the BOOTCFG register in the System Module in order to respond

properly by executing any required device init, bringing mDDR out of self-refresh, and branching to

user entry point in mDDR.

• The RBL supports 3 distinct boot modes:

–

BTSEL[1:0] = 00 - ARM NAND Boot

–

BTSEL[1:0] = 10 - ARM MMC/SD Boot

–

BTSEL[1:0] = 11 - ARM UART Boot

• If NAND boot fails, then MMC/SD mode is tried.

• If MMC/SD boot fails, then MMC/SD boot is tried again.

• If UART boot fails, then UART boot is tried again.

• RBL uses GIO61 to indicate boot status (can use to blink LED):

–

After reset, GIO61 is initially driven low (e.g LED off)

–

If NAND boot fails and then MMC/SD boot fails, then GIO61 shall toggle at 4Hz while MMC/SD

boot is retried.

–

If MMC/SD boot fails, then GIO61 shall toggle at 4Hz while MMC/SD boot is retried

–

If UART boot fails, then GIO61 shall toggle at 2Hz while UART boot is retried

–

When boot is successful, just before program control is given to UBL, GIO61 is driven high (e.g.

LED on)

–

DM355 Timer0 shall be used to accurately toggle GIO61 at 4Hz and 2Hz

• ARM ROM Boot - NAND Mode

–

No support for a full firmware boot. Instead, copies a second stage user boot loader (UBL) from

NAND flash to ARM internal RAM (AIM) and transfers control to the user-defined UBL.

–

Support for NAND with page sizes up to 2048 bytes.

–

Support for magic number error detection and retry (up to 24 times) when loading UBL

–

Support for up to 30KB UBL (32KB IRAM - ~2KB for RBL stack)

–

Optional, user-selectable, support for use of DMA and I-cache during RBL execution (i.e.,while

loading UBL)

–

Supports booting from 8-bit NAND devices (16-bit NAND devices are not supported)

–

Supports 4-bit ECC (1-bit ECC is not supported)

–

Supports NAND flash that requires chip select to stay low during the tR read time

–

Supports Fast Boot option, which allows you to quickly boot and recover from a low power mode

• ARM ROM Boot - MMC/SD Mode

–

No support for a full firmware boot. Instead, copies a second stage Uwer Boot Loader (UBL) from

MMC/SD to ARm Internal RAM (AIM) and transfers control to the user software.

–

Support for MMC/SD Native protocol (MMC/SD SPI protocol is not supported)

–

Support for descriptor error detection and retry (up to 24 times) when loading UBL

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