AN2606 datasheet(52/155 Pages) STMICROELECTRONICS

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STM32F40xxx/41xxx devices bootloader

AN2606

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DocID13801 Rev 21

11.1.3

Bootloader version

The following table lists the STM32F40xxx/41xxx devices V3.x bootloader versions:

Table 23. STM32F40xxx/41xxx bootloader V3.x versions

Bootloader

version

number

Description

Known limitations

V3.0

Initial bootloader version

– When a Read Memory command or Write

Memory command is issued with an unsupported

memory address and a correct address

checksum (ie. address 0x6000 0000), the

command is aborted by the bootloader device,

but the NACK (0x1F) is not sent to the host. As a

result, the next 2 bytes (which are the number of

bytes to be read/written and its checksum) are

considered as a new command and its

checksum(1).

– Option bytes, OTP and Device Feature

descriptors (in DFU interface) are set to “g”

instead of “e” (not erasable memory areas).

1. If the “number of data - 1” (N-1) to be read/written is not equal to a valid command code (0x00, 0x01, 0x02,

0x11, 0x21, 0x31, 0x43, 0x44, 0x63, 0x73, 0x82 or 0x92), then the limitation is not perceived from the host

since the command is NACKed anyway (as an unsupported new command).

V3.1

Fix V3.0 limitations. DFU

interface robustness

enhancement.

– 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.

– For the CAN interface, the Write Unprotect

command is not functional. Instead you can use

Write Memory command and write directly to the

option bytes in order to disable the write

protection.

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