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shadow578 / Marlin-H32

Marlin for HC32F460 based printers (now in upstream)
http://marlinfw.org
GNU General Public License v3.0
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[BUG] flash memory limit low? #25

Closed classicrocker883 closed 1 year ago

classicrocker883 commented 1 year ago

Did you test the latest bugfix-2.1.x code?

Yes, and the problem still exists.

Bug Description

it seem as though FLASH: is limited to 211936 B. the other Aquila chips are limited to 89% of 262144 Bytes (= 256kb) or ~233,300 B.

unlocking this extra space would be helpful. is there a way the chip can handle more flash space? or would this ultimately brick it?

Bug Timeline

No response

Expected behavior

No response

Actual behavior

No response

Steps to Reproduce

No response

Version of Marlin Firmware

pio_build/bugfix

Printer model

No response

Electronics

No response

Add-ons

No response

Bed Leveling

None

Your Slicer

None

Host Software

None

Don't forget to include

Additional information & file uploads

No response

shadow578 commented 1 year ago

could you give more details on what branch you're working with? Is it the aquila branch or one of the pio branches?

Answering more generall (as this is probably is true for both):

  1. the HC32F46x series consists of two main ICs: the HC32F460xCxx and HC32F460xExx (were x=dont care), with the main difference beign that the first has 256K of flash, and the former has 512K.

  2. not all of flash is usable. from 0x0000 to 0xC000 is the bootloader, so of the 256K version only (262.144 - 0xC000 =) 212.992 (about 208K) are usable for Marlin. This ofc assumes one wants to keep the bootloader, if you were to directly flash the ic you cold use all of flash.

So, TL;DR:

no, you cannot unlock more flash unless you remove the bootloader, which you should probably not do. However, you could check if your board uses the 512K version of the HC32F46x. If this is the case, you can use more flash.

classicrocker883 commented 1 year ago

that is a good reply thank you. I was using the pio_buid/bugfix. so that makes me wonder what is actually on these boards, because all the G32 and N32 for Aquila are RCT6 (256k) so I imagine same goes for the H32. but is it possible they might have been shipped with the 512k version?

and how much chip memory s on your board if I may ask. 256 or 512? I don't actually have a Hc32, instead I've been using a G32.

shadow578 commented 1 year ago

and how much chip memory s on your board if I may ask. 256 or 512?

i actually never checked, i always assumed they'd ship the 256K version since it's cheaper.