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!BOOT_MODE[1:0]
!Boot type
!S12.12 (BOOT_MODE1)!S12.21 (BOOT_MODE0)
!Notes
|-
| 00||Boot from eFUSEs||off||off||'''Supported on request only'''
|-
| 01||Serial downloader||off||on||
|-
| 10||Internal boot||on||off||Default
|-
| 11||reserved|| || ||
|}
[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
selection of the device from which the Boot ROM retrieves Program Image along with several further device-specific configuration settings, can be done in two different ways, depending on <code>BT_FUSE_SEL</code> bit:
* 0 (shipped value): GPIOs
**This technique - also known as ''GPIO override'' - is typically used during the development stage. It allows to use 24 GPIOs (specifically LCD1_DATA[23:00]) to configure <code>BOOT_CFG</code> bits.
* 1: eFUSE.
**In this case <code>BOOT_CFG</code> bits are fetched from OTP memory.
===Serial downloader===
