Enabling USB-Bootmode

The Boot from USB Mode, or sometimes called Download Mode, is necessary to change the operating system on your board. In this mode you’re able to flash the bootloader, eMMC or NAND with manufacturing tools.

QS(X) Modules

Module Boot from USB/UART Boot from eMMC/NAND
QS8M-* Connect to high (H) Leave open or low (L)
QSXM-* Connect to high (H) Leave open or low (L)
QSXP-* Connect to high (H) Leave open or low (L)
QSMP-* Connect to low (L) Leave open or high (H)

TX Modules

Module Boot from USB/UART Boot from eMMC/NAND
TX* Connect Bootmode Pins (L) Leave open (H)

Physical Pins

QSBASE1

The 3 bootmode pins are located next to the RGB display output. With the jumper the bootmode can be set to high (H) or low (L).

../../_images/bootmode_qsbase1.png

QSBASE1 Bootmode Pins

QSBASE2

The 3 bootmode pins are located below the Raspi-Connector, next to the CAMERA input. With the jumper the bootmode can be pulled to high (H) or low (L).

../../_images/bootmode_qsbase2.jpg

QSBASE2 Bootmode Pins

QSBASE3

The 3 bootmode pins are located next to UART A. With the jumper the bootmode can be pulled to high (H) or low (L).

../../_images/bootmode_qsbase3.png

QSBASE3 Bootmode Pins

TX-(MIPI)-LVDS Mainboard

To bring your device into USB Boot Mode, place a jumper to connect the Boot Mode pins.

For normal boot, please check that the bootmode jumper is open.

../../_images/bootmode_jumper.jpg

Boot Mode jumper in place

JP1 is used to configure the boot mode and the JTAG topology.

JP1 pin mapping

JP1 pin mapping

There is only one JTAG on the chip, and two JTAG modes are supported. Between these modes is selected via the JTAG_MOD pin:

Mode JTAG_MOD Function
Debug mode 0 DAP is the only TAP controller in the daisy chain. SJC will be attached to JTAG-AP of DAP.
Test mode 1 SJC is the only TAP controller in the daisy chain. 1149.1-compliant, and support 1149.6 AC coupled test.

Do not touch the test mode pin!

TX Mainboard 7

To bring your device into USB Boot Mode, place a jumper to connect the Boot Mode pins.

../../_images/bootmode_mb7.jpg

MB7 Bootmode

TXUL EvalKit

To bring your device into USB Boot Mode, place a jumper to connect the Boot Mode pins.

JP1 pin mapping

TXUL EvalKit Bootmode