CDFJ support?

+Andrew Davie · December 6, 2021

I'd really really like to see some CDFJ capability added. I'd be prepared to assist, where possible!

Thomas Jentzsch · December 6, 2021

AFAIK the games would have to be recompiled to the PlusCart.

+Al_Nafuur · December 6, 2021

1 hour ago, Andrew Davie said:

I'd really really like to see some CDFJ capability added.

me too :sad:

1 hour ago, Thomas Jentzsch said:

AFAIK the games would have to be recompiled to the PlusCart.

Yes. Recompiled or patched.

Recompiling would be the easiest way, but could be done only by:

the developer
someone else, if the code is open source.

Patching is not reliable, but could additionally be done by:

the hardware (PlusCart/UnoCart) before emulating the ROM. This is probably very difficult to achieve.
a tool the user has to download.
a webservice where the user uploads his binary.
the PlusStore before sending the binary (will only work with the PlusCart).

1 hour ago, Andrew Davie said:

I'd be prepared to assist, where possible!

The incredibly fast, talented and helpful developer of gopher2600 @JetSetIlly has already added a switch to the config, so we can switch between the different ARM chips.

For DPC+ I have already build some test ROMs that work with gopher2600 and partly also with the PlusCart.

For CDFJ we would need a modified (recompiled) test ROM where the ARM memory base addresses are moved like this:

                            Harmony                 PlusCart/UnoCart
ARM_RAM_BASE                0x40000000              0x10000000
ARM_ROM_BASE                0x0000                  0x20000000

this ROM can be tested on gopher2600 when the "hardware.arm7.model" property in the preferences file (https://github.com/JetSetIlly/Gopher2600#configuration-directory) has been switched from:

hardware.arm7.model :: LPC2000

to:

hardware.arm7.model :: STM32F407VGT6

JetSetIlly · December 6, 2021

29 minutes ago, Al_Nafuur said:
this ROM can be tested on gopher2600 when the "hardware.arm7.model" property in the preferences file (https://github.com/JetSetIlly/Gopher2600#configuration-directory) has been switched from:
hardware.arm7.model :: LPC2000
to:
hardware.arm7.model :: STM32F407VGT6

To be clear, this only changes the memory map. Cycle counting will be different - it'll be similar but there's bound to be differences.

Thomas Jentzsch · December 6, 2021

Is it really that simple? That you only change the memory map and a program written for Harmony will run on PlusCart and vice versa? Aren't there any special functions used which differ between hardware?

Same for emulation. Just change the address offsets and then you can emulate programs written for STM32F?

JetSetIlly · December 6, 2021

59 minutes ago, Thomas Jentzsch said:

Is it really that simple? That you only change the memory map and a program written for Harmony will run on PlusCart and vice versa? Aren't there any special functions used which differ between hardware?

Same for emulation. Just change the address offsets and then you can emulate programs written for STM32F?

I expect there'll be other complications but the first step was to change the memory map for the new processor. I left it with @Al_Nafuur but I got the impression that he had compiled Harmony programs for the PlusCart's CPU and managed to get them running.

This is the memory map definitions for Gopher2600. As you can see, I've not identified the registers for the Timer or the MAM (I'm not even sure if there is a MAM in the STM32F). So as long as you don't need the timer then I suppose this is okay.

https://github.com/JetSetIlly/Gopher2600/blob/a096d74b314ec9a54dd7b7a969023b796dad3feb/hardware/memory/cartridge/harmony/arm7tdmi/memorymap.go

Thomas Jentzsch · December 6, 2021

Are there any PlusCart only test ROMs which use the ARM chip available?

+Al_Nafuur · December 6, 2021

8 minutes ago, Thomas Jentzsch said:

Are there any PlusCart only test ROMs which use the ARM chip available?

Public ROMs/DPC+ (experimental)/recompiled ARM/

I have posted the first version of the source code here:

this version of the code is using different base addresses.

Thomas Jentzsch · December 6, 2021

Yes, patching DPC+ is possible. But Andrew was asking for CDFJ. Any success with these?

JetSetIlly · December 7, 2021

10 hours ago, Thomas Jentzsch said:

Yes, patching DPC+ is possible. But Andrew was asking for CDFJ. Any success with these?

Not a problem for emulators, all the pieces are there, so it should work using the same ROM compilation method as for DPC+ ROMs.

For the PlusCart itself, there needs to be a reimplement of the CDFJ functions that are present in the Harmony driver.

Thomas Jentzsch · December 7, 2021

6 minutes ago, JetSetIlly said:

Not a problem for emulators, all the pieces are there, so it should work using the same ROM compilation method as for DPC+ ROMs.

Do you have some test ROMs?

JetSetIlly · December 7, 2021

2 minutes ago, Thomas Jentzsch said:

Do you have some test ROMs?

No.

+Al_Nafuur · December 7, 2021

12 hours ago, Thomas Jentzsch said:

Yes, patching DPC+ is possible.

I only managed to recompile some DPC+ ROMs, with patching I had no success so far (haven't tried this hard).

12 hours ago, Thomas Jentzsch said:

But Andrew was asking for CDFJ. Any success with these?

I haven't tried so far.

1 hour ago, Thomas Jentzsch said:

Do you have some test ROMs?

that was what I vaguely asked for in my first post here.

Thomas Jentzsch · December 7, 2021

@Andrew Davie Maybe you could provide such a ROM (CDFJ compiled for PlusCart)? Then @Al_Nafuur, @JetSetIlly and the Stella team can start working on the issue.

+Andrew Davie · December 7, 2021

1 hour ago, Thomas Jentzsch said:

@Andrew Davie Maybe you could provide such a ROM (CDFJ compiled for PlusCart)? Then @Al_Nafuur, @JetSetIlly and the Stella team can start working on the issue.

I'd be happy to do it... if only I knew what to do.

+Andrew Davie · December 7, 2021

Maybe this requires the changes in "defines_cdfj.h" ...?

// Raw queue pointers
void* DDR = (void*)0x40000800;
#define RAM ((unsigned char*)DDR)
#define RAM_INT ((unsigned int*)DDR)
#define RAM_SINT ((unsigned short int*)DDR)

#define ROM ((unsigned char*)0)
#define ROM_INT ((unsigned int*)0)
#define ROM_SINT ((unsigned short int*)0)

// Queue variables
unsigned int* const _QPTR=(unsigned int*)0x40000098;
unsigned int* const _QINC=(unsigned int*)0x40000124;
unsigned int* const _WAVEFORM=(unsigned int*)0x400001B0;

Thomas Jentzsch · December 7, 2021

3 minutes ago, Andrew Davie said:

Maybe this requires the changes in "defines_cdfj.h" ...?

Yup.

+Al_Nafuur · December 7, 2021

6 minutes ago, Andrew Davie said:

Maybe this requires the changes in "defines_cdfj.h" ...?


// Raw queue pointers
void* DDR = (void*)0x40000800;
#define RAM ((unsigned char*)DDR)
#define RAM_INT ((unsigned int*)DDR)
#define RAM_SINT ((unsigned short int*)DDR)

#define ROM ((unsigned char*)0)
#define ROM_INT ((unsigned int*)0)
#define ROM_SINT ((unsigned short int*)0)

// Queue variables
unsigned int* const _QPTR=(unsigned int*)0x40000098;
unsigned int* const _QINC=(unsigned int*)0x40000124;
unsigned int* const _WAVEFORM=(unsigned int*)0x400001B0;

yes.

basically everything with 0x4...... has to be moved to 0x1....... and everything with 0x0 has to be moved to 0x2.......

AND:

the memory definition in "custom/src/custom.boot.lds" has to be changed!

Edited December 7, 2021 by Al_Nafuur
add custom.boot.lds

+Andrew Davie · December 7, 2021

6 minutes ago, Al_Nafuur said:

yes.

basically everything with 0x4...... has to be moved to 0x1....... and everything with 0x0 has to be moved to 0x2.......

Untested on anything... still trying to find the config for gopher....

But I changed the defs in the header file as indicated....

cubiks20211207PlusCart#1.bin

+Andrew Davie · December 7, 2021

Not sure what "custom_boot.lds" is, but it has an 0x4000 address too...

OUTPUT_FORMAT("elf32-littlearm", "elf32-littlearm", "elf32-littlearm")
OUTPUT_ARCH(arm)

/* Entry Point  */
ENTRY(Custom)

/* LPC2103 memory areas  */
MEMORY 
{
    boot (RX)   : ORIGIN = 0x800     , LENGTH = 0x80    /* C-runtime booter */
    C_code (RX) : ORIGIN = 0x880     , LENGTH = 0x6780  /* C code (26K) */

    ram         : ORIGIN = 0x40001800, LENGTH = 0x800   /* 2K free RAM */
/*    ram         : ORIGIN = 0x40001400, LENGTH = 0xC00 */  /* 3K free RAM, took 1K from Display Data */
/*    ram         : ORIGIN = 0x40001300, LENGTH = 0xD00 */  /* 3.25K free RAM, took 1.25K from Display Data */
/*    ram         : ORIGIN = 0x400012C0, LENGTH = 0xD40 */  /* 3392 bytes free RAM, took 1344 from Display Data */

}

/* Global symbol _stack_end */
_stack_end = 0x40001FDC;

/* Output sections  */
SECTIONS
{
    .bootcode :
    {
        _sboot = .;
        *(.boot)
        . = ALIGN(4);
        _eboot = .;
    } > boot

    .text : {
        .stext = .;
        . = ALIGN(4);
        *(.text)
        *(.text.*)
        *(.rodata)
        *(.rodata*)
        . = ALIGN(4);
        _etext = .;
    } >C_code
    
    .data : AT ( _etext ) {
        . = ALIGN(4);
        _sdata = .;
        *(.data)
        *(.data.*)
        . = ALIGN(4);
        _edata = .;
    } >ram
    
    .bss : {
        . = ALIGN(4);
        _sbss = .;
        *(.bss)
        *(COMMON)
        . = ALIGN(4);
        _ebss = .;
    } >ram
}
end = .;

+Andrew Davie · December 7, 2021

.. also custom.S

/******************************************************************************
File: custom.S
Description: Harmony Custom C Code Booter
(C) Copyright 2016 - Chris Walton, Fred Quimby, Darrell Spice Jr
******************************************************************************/

/* Start in ARM mode */
.arm

/* Put code in boot section */
.section  .boot,"ax",%progbits

/* Entry Point */
.global   Custom
.func     Custom
Custom:

  /* Switch to THUMB mode */
  add     r0, pc, #1
  bx      r0
.thumb

  /* Fetch value from CU header */
  ldr     r0, =0x40000024
  ldr     r2, [r0]
  
  /* Skip if data already copied */
  cmp     r2, #0
  bmi     SkipCopy
  add     r2, #1
  str     r2,[r0]
  cmp     r2, #1
  bne     SkipCopy

  /* Clear BSS section */
  mov     r0, #0
  ldr     r1, =_ebss
  ldr     r2, =_sbss
  sub     r1, r1, r2
ClearBssLoop:
  sub     r1, #4
  bmi     EndClearBss
  str     r0, [r2, +r1]
  bne     ClearBssLoop
EndClearBss:

  /* Copy C data section to RAM */
  ldr     r0, =_etext
  ldr     r1, =_edata
  ldr     r2, =_sdata
  sub     r1, r1, r2
CopyLoop:
  sub     r1, #4
  bmi     SkipCopy
  ldr     r3, [r0, +r1]
  str     r3, [r2, +r1]
  bne     CopyLoop
SkipCopy:

  /* Push return addess on stack */
  push    {lr}
  
  /* Put ReturnToBUS address in LR */
  ldr     r0, =ReturnToBUS+1
  mov     lr, r0

  /* Jump to main in C code */
  ldr     r0, =main
  bx      r0

ReturnToBUS:
  /* Return to BUS (switch to ARM mode) */
  pop     {r0}
  bx      r0

Thomas Jentzsch · December 7, 2021

1 minute ago, Andrew Davie said:

Not sure what "custom_boot.lds" is, but it has an 0x4000 address too...

Actually two. I am not 100% sure, but the (c_)boot memory addresses might have to be changed to.

It's not easy to identify all the 0x addresses. These are often not defined as 0x0000.... but only as 0x.....

+Al_Nafuur · December 7, 2021

3 minutes ago, Andrew Davie said:

Not sure what "custom_boot.lds" is, but it has an 0x4000 address too...

these have to be changed too.

3 minutes ago, Andrew Davie said:

.. also custom.S

this doesn't need to be changed. The PlusCart (and the emulators too ?) don't run this

+Andrew Davie · December 7, 2021

5 minutes ago, Al_Nafuur said:

these have to be changed too.

this doesn't need to be changed. The PlusCart (and the emulators too ?) don't run this

Here are my changed lines...

/* LPC2103 memory areas  */
MEMORY 
{
    boot (RX)   : ORIGIN = 0x20000800     , LENGTH = 0x80    /* C-runtime booter */
    C_code (RX) : ORIGIN = 0x20000880     , LENGTH = 0x6780  /* C code (26K) */
    ram         : ORIGIN = 0x10001800, LENGTH = 0x800   /* 2K free RAM */
}



/* Global symbol _stack_end */
_stack_end = 0x10001FDC;

cubiks20211207PlusCart#2.bin

+Al_Nafuur · December 7, 2021

14 minutes ago, Andrew Davie said:

Untested on anything... still trying to find the config for gopher....

But I changed the defs in the header file as indicated....

cubiks20211207PlusCart#1.bin 32 kB · 1 download

black screen, 6502 code is running..

CDFJ support?

Recommended Posts

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Recently Browsing 0 members