05518: jaguar n64: When attempting a cheat init from the debugger, it reports "No writable bytes found in this area"

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
05518	Debugger	Minor	Always	Apr 10, 2014, 23:01	Apr 16, 2014, 23:23

Tester	rimsky82	View Status	Public	Platform	MESS (Self-compiled)
Assigned To		Resolution	Open	OS	Windows Vista/7/8 (64-bit)
Status [?]	Acknowledged			Driver	atari/jaguar.cpp
Version	0.153	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	05518: jaguar n64: When attempting a cheat init from the debugger, it reports "No writable bytes found in this area"
Description	maincpu region- Possibly affecting other systems, but without knowing too much about the internals of MESS I would assume this is a per-system issue.
Steps To Reproduce	Start a jaguar game with the -debug parameter, type "ci" in the debugger console.
Additional Information	Can't search RAM for values, making it hard to find cheat values, or values for watchpoints.
Github Commit

Flags
Regression Version
Affected Sets / Systems	jaguar n64

Attached Files

No.10574 Pugsy Developer Apr 15, 2014, 20:59 edited on: Apr 15, 2014, 21:04	I've encountered it a few times over the years and I've worked around it by bypassing the memory sanity check - which is obviously the wrong thing to do (which is why I've never submitted it). Each system should ideally be fixed for cheat searching individually, but it's such a minor issue that I can't see anybody being that bothered about it. This is a global fiddle that does allow you to search, though you will likely need to enter the search areas manually eg CI UB 0,FFFFFF instead of CI. in debugcmd.c Change the INLINE int cheat_address_is_valid function to always RETURN TRUE :- INLINE int cheat_address_is_valid(address_space &space, offs_t address) { return TRUE; //bypass the validity check } I think that's the only line and file that I needed to change ( I might be wrong ) but cheat searching in jaguar has worked for me some time (hence the jaguar cheat collection).
No.10578 rimsky82 Tester Apr 16, 2014, 21:56	Thanks Pugsy. That should do well until a more proper fix is submitted. Not many seem to be as excited as me when it comes to the capabilities, and more-so the potential of the debugger.
No.10579 Pugsy Developer Apr 16, 2014, 23:23 edited on: Apr 16, 2014, 23:23	No problem. Yes, over a decade of using MAME/MESS debugger has ruined me for other emulators/cheat engines. Why drive a Trabant when there's a Bugatti Veyron in the garage. Unfortunately the emulation of some systems in MESS means the roads you want to drive the Veyron on are either dead ends or pot-holed to buggery ;)