bugAVR Downloader/UploaDEr - Bugs: bug #53703, FT232H based programmer returns...


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bug #53703: FT232H based programmer returns all 0xFF when reading flash from atmega2560

Submitter:  None
Submitted:  Thu 19 Apr 2018 10:07:59 PM UTC
Category:  None Severity:  3 - Normal
Priority:  5 - Normal Item Group:  None
Status:  Need Info Privacy:  Public
Assigned to:  None Originator Name:  Christoph
Originator Email:  -email is unavailable- Open/Closed:  Open
Release:  6.3 Programmer hardware:  FT232H
Device type:  m2560

Fri 10 Dec 2021 09:54:05 PM UTC, comment #1: 

Well, I think the logic behind this still has some issues.

Looking at "native" programming algorithms (in avr.c), the usual decision logic is:

   * If this device has a "load extended address" command, issue it.
  lext = mem->op[AVR_OP_LOAD_EXT_ADDR];
  if (lext != NULL) {

Issuing the load extended address command only for few selected addresses is error-prone: not every load file has to start at addr==0, for example.

Joerg Wunsch <joerg_wunsch>
Group administrator
Thu 19 Apr 2018 10:07:59 PM UTC, original submission:  

avrftdi.c does not send load extended address byte command when address is lower than 64k word but using a device which need this command. See attached patch for bug-fix.



(Note: upload size limit is set to 16384 kB, after insertion of the required escape characters.)

Attached Files
file #43979:  avrftdi.c.patch added by None (810B - text/x-patch)


Depends on the following items: None found

Items that depend on this one: None found


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  • -email is unavailable- added by joerg_wunsch (Posted a comment)
  • -email is unavailable- added by None (Submitted the item)

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    Follow 2 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2021-12-10 joerg_wunsch StatusNone Need Info
    2018-04-19 None Attached File- Added avrftdi.c.patch, #43979

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