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) |
QSRZ-* |
Connect to high (H) |
Leave open or low (L) |
QS93-* |
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).
QSBASE1 Bootmode Pins¶
QSBASE2¶
The 3 bootmode pins are located below the Raspberry Pi-Connector, next to the CAMERA input. With the jumper the bootmode can be pulled to high (H) or low (L).
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).
QSBASE3 Bootmode Pins¶
QSBASE4¶
The 3 bootmode pins are located next to UART A. With the jumper the bootmode can be pulled to high (H) or low (L).
QSBASE4 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.
Boot Mode jumper in place¶
JP1 is used to configure the boot mode and the JTAG topology.
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 connect the TEST_MODE pin!
TX Mainboard 7¶
To bring your device into USB Boot Mode, place a jumper to connect the Boot Mode pins.
MB7 Bootmode¶
TXUL EvalKit¶
To bring your device into USB Boot Mode, place a jumper to connect the Boot Mode pins.
TXUL EvalKit Bootmode¶