Is this an Error in the STMH7B3xi Datasheet?

[Claydonkey]

Section Memories

...

The Flash memory is organized as follows:

• Two independent 1 Mbyte banks of user Flash memory, each one containing 128 user sectors of 8 Kbytes

each.

• 128 Kbytes of System Flash memory from which the device can boot.

• 1 Kbyte of OTP (one-time programmable) memory containing option bytes for user configuration

Shouldn't this read:

The Flash memory is organized as follows:

• Two independent 1 Mbyte banks of user Flash memory, each one containing 8 user sectors of 128 Kbytes

each.

[Claydonkey]

I spose I should RTFM!!!

I was looking at openblt and for H7xx devices there is a struct 'tFlashSector'

which reads:

#elif (BOOT_NVM_SIZE_KB == 2048)
    /* { 0x08000000, 0x20000, 0, 1 },     flash sector idx 0 - reserved for bootloader */
    { 0x08020000, 0x20000, 1, 1},        /* flash sector idx  1 - 128kb                */
    { 0x08040000, 0x20000, 2, 1},        /* flash sector idx  2 - 128kb                */
...
    { 0x081C0000, 0x20000, 6, 2},        /* flash sector idx 14 - 128kb                */
    { 0x081E0000, 0x20000, 7, 2},        /* flash sector idx 15 - 128kb                */

Never ASSUME... it makes an *** out of U and ME

 

So the fact is:

H74x devices have 8 sectors of 128K

H7A(B) device do indeed have 128 sectors of 8K

Go figure

Equipped with this knowledge openblt struct should be:

static const tFlashSector flashLayout[] =
{
/* (BOOT_NVM_SIZE_KB == 2048) */
      {0x8020000,0x2000,16,1}, /* flash sector idx 16 - 8kb        */
      {0x8022000,0x2000,17,1}, /* flash sector idx 17 - 8kb        */
…
{0x81FA000,0x2000,125,2}, /* flash sector idx 125 bank2 - 8kb        */
      {0x81FC000,0x2000,126,2}, /* flash sector idx 126 bank2 - 8kb        */
      {0x81FE000,0x2000,127,2}, /* flash sector idx 127 bank2 - 8kb        */
}

[Amel NASRI]

Hi @Claydonkey​ ,

Are you speaking about OpenBL from ST?

I don't see STM32H7 example there. could you please provide some more precision?

-Amel

[Claydonkey]

May I apologise for the delay replying.

My use case was for openblt not openbl

I think the best way to explain how my misunderstanding was resolved is to look at

https://github.com/claydonkey/openblt/tree/master/Target/Demo/ARMCM7_STM32H7_Nucleo_H7A3ZI_CubeIDE

in particular:

https://github.com/claydonkey/openblt/blob/master/Target/Source/ARMCM7_STM32H7/flash.c

and

https://github.com/claydonkey/openblt/blob/master/Target/Source/ARMCM7_STM32H7/usb.c

Understandably the STM327A(B) chips are very different beasts to the STM327xx series

[Tesla DeLorean]

>>Understandably the STM327A(B) chips are very different beasts to the STM327xx series

The H7's are a random bag of spanners..

The smaller uniform flash blocks honestly more helpful than the large ones making the H7B0 a lot more usable than the H750's if you assume there's only 128KB available. I hadn't picked up on all the differences, especially the 8KB blocks.

The H72x and H7Ax have OCTOSPI