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{{ImportantMessage|text=SBC Lynx is extremely flexible in terms of hardware configurations. This document describes main options related to booting. In case you need a configuration that is not listed here, please contact [mailto:sales@dave.eu|Sales department].}}
==Introduction==
[1] Nevertheless, SBC Lynx can support this option. This is a clear example of a feature that can be implemented on request. For more information please contact [mailto:sales@dave.eu|Sales department].
===Internal boot===
When ''Internal boot'' mode is selected, ''GPIO override'' technique is used to configure bootstrap flags, also known as <code>BOOT_CFG</code> bits. This means that 24 processor's signals - specifically LCD1_DATA[23:00] - are latched by iMX6UL processor upon reset to get bootstrap flags. As such, these signals need to be pulled up or down to select the proper configuration.
The following table summarizes these configurations. Pull-up/down resistors are 10kOhm.
!Notes
|-
| XUBx0xxx<br>XUBx2xxx|| pull-down || pull-down || pull-down || pull-down || pull-up || pull-down || pull-down || pull-down || pull-up || pull-up || pull-up || pull-up || pull-up || pull-down || pull-up || pull-up || pull-down || pull-down || pull-up || pull-up || pull-up || pull-up || pull-up || pull-up || TBD
|-
| XUBx1xxx<br>XUBx2xxx|| TBD || TBD || TBD || TBD || TBD || TBD || TBD || TBD || TBD || TBD || TBD || TBD || TBD || TBD || TBD || TBD || TBD || TBD || TBD || TBD || TBD || || TBD || TBD || TBD ||TBD
|}
The following sections provides additional notes related to the use of Internal boot on SBC Lynx.
=====Ordering codes XUBx1000=====
===Serial downloader===
Generally speaking, serial downloader allows to download a program image to the target over USB or UART connections. The following flow chart details the sequence of operations that are performed by BootROM in Serial Download mode (source ''Applications Processor Reference Manual''<ref name="IMX6ULRM"></ref>.
[[File:IMX6UL-serial-downloader-flow-chart.jpg|thumb|center|600px|Serial download boot flow]]
The following sections provides additional notes related to the use of Serial Downloader on SBC Lynx in order to warn the user about possible conflicts that may occur depending on what is connected to USBOTG1 port, UART1 and UART2 interfaces.
=====Ordering codes XUBx1000=====
UART1: this UART is routed to connector J42 that is typically used for console.
UART2: this UART is routed to connector J46 that is dedicated to optional [[Wireless_Module_(DWM)|DWM WiFi/Bluetooth module]]. Even if DWM is populated, non electrical conflicts occur.
USBOTG1: this interface is connected to J55. The use of this port is user defined.
==References==
{{reflist}}
