cube programmer shows 256 pages of 2K in a 256K mcu?

[Akshat_codes_]

I am using a stm32 F103RCT6 mcu. It has 256 Kb of flash memory. But when i connect it to cube programmer, it shows there are 256 sectors of 2K size which equates to 512 Kb flash. 

I was even able to go to that last page and write data to it. so is the linker script generated by HAL wrong?

[Andrew Neil]

---

@Akshat_codes_ wrote:

I am using a stm32 F103RCT6

---

Where did you obtain it?

Are you sure it is genuine?

[Akshat_codes_]

I ordered it from LCSC. Attached below is the image

[Andrew Neil]

---

@Akshat_codes_ wrote:

I ordered it from LCSC.

---

You mean here: https://www.lcsc.com/ ?

Not an Authorised Distributor, so there is a risk it's fake.

Maybe this diagnostic can help you identify it ...

[AScha.3 · Accepted solution]

Nothing wrong here. :)

Just you got a F103 with full flash, 512K.  

Reason is: for the purpose of rationalized production only one die is produced , with 512K .

Testing the flash is "expensive" on the chip tester, so short test -> smaller flash tested -> cheaper version.

So you have a chip with 256K flash, tested and 100% working - as you ordered.

And there is more flash on the die, might work fine or not - you didnt pay for tested 512K .

So you can use it, but dont cry, if there is an error....

And linker script is ok, if 256K is used, as you ordered.

[Andrew Neil]

but shouldn't CubeIDE CubeProgrammer recognise the chip from its ID, and only report the specified memory sizes ?

[AScha.3]

Maybe, if different ID is written to chip, but basically is same die for c-d-e flash size:

vs.

connect a H743ZG  , 1MB flash (but die has 2MB :(

and all are 450 die :

But obviously here something written to the chip, to disable dual core, flash size info, etc.

So i tried using the 2MB flash - and yes, its there - but not tested, as ordered version has 1MB.

+ here connect to H743ZI , 2MB  , ordered:

2MB verified.

[Akshat_codes_]

ok thanks for the response.