AN2606 datasheet(41/155 Pages) STMICROELECTRONICS

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AN2606

STM32L1xxxD devices bootloader

154

9.3

Bootloader version

The following table lists the STM32L1xxxD devices bootloader versions:

Table 17. STM32L1xxxD bootloader versions

Bootloader version

number

Description

Known limitations

V4.1

Initial bootloader version

– In the bootloader code the PA13

(JTMS/SWDIO) I/O output speed

is configured to 400 KHz, as

consequence some debugger can

not connect to the device in Serial

Wire mode when the bootloader is

running.

– When the DFU bootloader is

selected, the RTC is reset and thus

all RTC information (calendar,

alarm, ...) will be lost including

backup registers. Note: When the

USART bootloader is selected

there is no change on the RTC

configuration (including backup

registers).

V4.2

Fix V4.1 limitations (available on

Rev.Z devices only.)

– Stack overflow by 8 bytes when

jumping to Bank1/Bank2 if BFB2=0

or when Read Protection level is

set to 2.

Workaround: the user code should

force in the startup file the top of

stack address before to jump to the

main program. This can be done in

the “Reset_Handler” routine.

– When the Stack of the user code is

placed outside the SRAM (ie. @

0x2000C000) the bootloader

cannot jump to that user code

which is considered invalid. This

might happen when using

compilers which place the stack at

a non-physical address at the top

of the SRAM (ie. @ 0x2000C000).

Workaround: place manually the

stack at a physical address.

V4.5

Fix V4.2 limitations.

DFU interface robustness

enhancements (available on Rev.Y

devices only).

– For the USART interface, two

consecutive NACKs (instead of 1

NACK) are sent when a Read

Memory or Write Memory

command is sent and the RDP

level is active.

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