Boot From Rss; Figure 17. Boot0 Modification To Set The High-Level Logic - ST STM32L562E-DK User Manual

Proposed workaround:
Instead of the bootloader interface, the user can use JTAG to set the TZEN option bit.
Issue observed:
Go command on USB-DFU interface: The user cannot use the Go command through bootloader on the USB-DFU
interface.
Proposed workaround:
Instead of the USB-DFU interface, the user can use JTAG or any other communication port supported by the
bootloader to run the Go command, like USART, I
Caution: Only SFI through JTAG is fully supported on bootloader V9.0. SFI through bootloader interfaces is partially
supported because the bootloader cannot manage some option bytes and they must be set through JTAG.
6.4.2

Boot from RSS

On STM32L562E-DK, the PH3-BOOT0 is fixed to a low level allowing the boot from the memory address defined
by the SECBOOTADD0 option byte. To change the boot from RSS, it is needed to set the PH3-BOOT0 to the high
level by removing R32 and soldering R31, or just by applying 3V3 on the PH3-BOOT0 signal between R32 and
R31. In this second case, it is not necessary to remove R32 or to add R31.
Figure 17 explains how to connect 3V3 to BOOT0.
UM2617 - Rev 7
Figure 17. BOOT0 modification to set the high‑level logic
LCD 240x240 + CTP
2
C, SPI, or CAN FD.
UM2617
RSS/bootloader
100kΩ pull up (DNF)
(R31)
Set 3V3 on the common point between R32 and R33.
Example wire between Pmod pin6 (3V3) and
the common point between R32 and R33
Ω
100k pull down
(R32)
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