Is Arduino mega 2560 supported?

[dm-vev]

Hello! I want to install xinu on arduino mega 2560, is it possible? When I build this project and run it on my arduino, it always reloads after displaying free memory

[zrafa]

First of all, you must modify compile/Makefie, and change the atmega328p with the proper gcc label for atmega2560. Also, we could find other problems in the code, for example, the start and end addresses of RAM. But you could try the first advice and then check what happens. I will wait your message about how the things are going. R

On Thu, Aug 11, 2022 at 2:05 PM dm-vev @.***> wrote:

Hello! I want to install xinu on arduino mega 2560, is it possible? When I build this project and run it on my arduino, it always reloads after displaying free memory

— Reply to this email directly, view it on GitHub https://github.com/zrafa/xinu-avr/issues/4, or unsubscribe https://github.com/notifications/unsubscribe-auth/AAGDNWC5ZJLSXG4ODKEOFX3VYUXHLANCNFSM56I47DSA . You are receiving this because you are subscribed to this thread.Message ID: @.***>

[dm-vev]

Thanks for the answer! First of all, I changed these parameters for my Arduino Mega.

As for your RAM guess, it's probably the problem, because the welcome screen showed too little free RAM (<800 bytes).

[fredcwbr]

How did this evolve?

[fredcwbr]

Followed your directions,

Can get it booted, and memory size now seems OK , but it loops in the startup, can't get to the shell ., could use some help here.

Here's the patch with the mod untill now.,. Great work by the way.,

fredcw@teste0itx:~/C/xinu-avr$ cat mod_2560-v0_1.patch 
diff --git a/apps/shell/main.c b/apps/shell/main.c
index f73caf0..a85959a 100644
--- a/apps/shell/main.c
+++ b/apps/shell/main.c
@@ -448,6 +448,6 @@ process main(void)

     /* Terminate the shell process by returning from the top level */

-    // fprintf(dev,SHELL_EXITMSG);
+    fprintf(dev,SHELL_EXITMSG);
     return OK;
 }
diff --git a/apps/shell/xsh_memdump.c b/apps/shell/xsh_memdump.c
index 136f26c..17d57e6 100644
--- a/apps/shell/xsh_memdump.c
+++ b/apps/shell/xsh_memdump.c
@@ -21,7 +21,8 @@ shellcmd xsh_memdump(int nargs, char *args[])
 {

    int from = 0;
-   int to = 0x8FF;     /* AVR atmega328p top RAM address */
+   // int to = 0x8FF;      /* AVR atmega328p top RAM address */
+   int to = 0x10FF;        /* AVR atmega2560 top RAM address */

    if (nargs == 3) {
        from = args[1];
diff --git a/compile/Makefile b/compile/Makefile
index f6c595f..53102dc 100644
--- a/compile/Makefile
+++ b/compile/Makefile
@@ -9,7 +9,10 @@
 #########################################################################

 COMPILER_ROOT  =   avr-
-PNAME      =   ATMEGA328P
+PNAME      =   ATMEGA2560
+# PNAME        =   ATMEGA328P
+PAVRDUDE   =   atmega2560
+# PAVRDUDE =   atmega328p
 PLAT       =   Platform_$(PNAME)
 TOPDIR     =   ..

@@ -54,8 +57,8 @@ DEFS      =   -DVERSION=\""Xinu AVR 0.1 RAFA\0"\"

 # Compiler flags
 # CFLAGS  = -mcpu=cortex-m3 -mno-unaligned-access -mthumb -fno-builtin -fno-stack-protector -nostdlib -c -Wall -O ${DEFS} ${INCLUDE}
-# CFLAGS  = -DF_CPU=16000000UL -mmcu=atmega328p -mrelax -fno-builtin -fno-stack-protector -nostdlib -c -Wall -Os ${DEFS} ${INCLUDE}
-CFLAGS  = -DF_CPU=16000000UL -mmcu=atmega328p  -fno-builtin -c -Wall -Os ${DEFS} ${INCLUDE}
+# CFLAGS  = -DF_CPU=16000000UL -mmcu=${PAVRDUDE} -mrelax -fno-builtin -fno-stack-protector -nostdlib -c -Wall -Os ${DEFS} ${INCLUDE}
+CFLAGS  = -DF_CPU=16000000UL -mmcu=${PAVRDUDE}  -fno-builtin -c -Wall -Os ${DEFS} ${INCLUDE}
 # RAFA AGREGA LAS 3 de ABAJO para reducir size
 CFLAGS += -Wl,-static
 CFLAGS += -ffunction-sections
@@ -69,8 +72,8 @@ SFLAGS  = ${INCLUDE}
 # Loader flags

 # RAFA LDFLAGS = -Wl,--wrap,malloc,--wrap,free,--wrap,realloc,--wrap,fdevopen
-# LDFLAGS = -mmcu=atmega328p -nostartfiles -T ld.script  -Wl,-Map,xinu.map
-LDFLAGS = -mmcu=atmega328p -Wl,-Map,xinu.map -lm -Wl,--gc-sections -mrelax
+# LDFLAGS = -mmcu=${PAVRDUDE} -nostartfiles -T ld.script  -Wl,-Map,xinu.map
+LDFLAGS = -mmcu=${PAVRDUDE} -Wl,-Map,xinu.map -lm -Wl,--gc-sections -mrelax

 all:   xinu
@@ -135,9 +138,12 @@ examine-header:

 flash:
    avr-objcopy -O ihex -R .eeprom $(XINU) $(XINUHEX)
-   avrdude -p atmega328p -c arduino -P `ls -1 /dev/ttyUSB* /dev/ttyACM* 2>/dev/null | head -1` -b 57600 -D -U flash:w:$(XINUHEX):i 
-   #|| avrdude -p atmega328p -c arduino -P /dev/ttyACM0 -b 115200 -D -U flash:w:$(XINUHEX):i || avrdude -p atmega328p -c arduino -P /dev/ttyUSB0 -b 115200 -D -U flash:w:$(XINUHEX):i || avrdude -p atmega328p -c arduino -P /dev/ttyUSB0 -b 57600 -D -U flash:w:$(XINUHEX):i || avrdude -p atmega328p -c arduino -P /dev/ttyUSB0 -b 57600 -D -U flash:w:$(XINUHEX):i
-   # avrdude -p atmega328p -c arduino -P /dev/ttyUSB0 -b 115200 -D -U flash:w:$(FIRMWARE):i
+   avrdude -p ${PAVRDUDE} -c arduino -P `ls -1 /dev/ttyUSB* /dev/ttyACM* 2>/dev/null | head -1` -b 57600 -D -U flash:w:$(XINUHEX):i 
+   #|| avrdude -p ${PAVRDUDE} -c arduino -P /dev/ttyACM0 -b 115200 -D -U flash:w:$(XINUHEX):i || avrdude -p ${PAVRDUDE} -c arduino -P /dev/ttyUSB0 -b 115200 -D -U flash:w:$(XINUHEX):i || avrdude -p ${PAVRDUDE} -c arduino -P /dev/ttyUSB0 -b 57600 -D -U flash:w:$(XINUHEX):i || avrdude -p ${PAVRDUDE} -c arduino -P /dev/ttyUSB0 -b 57600 -D -U flash:w:$(XINUHEX):i
+   # avrdude -p ${PAVRDUDE} -c arduino -P /dev/ttyUSB0 -b 115200 -D -U flash:w:$(FIRMWARE):i
+
+flash2560:
+    avrdude -C/etc/avrdude.conf -v -p${PAVRDUDE} -c wiring -P/dev/ttyACM0 -b115200 -D -Uflash:w:${XINUHEX}:i

 qemu:
diff --git a/compile/version b/compile/version
index 56980bd..938ac1e 100644
--- a/compile/version
+++ b/compile/version
@@ -1 +1 @@
-Xinu for ATMEGA328P -- version #281  (lechnerm)  mié may 27 10:45:49 -03 2020
+Xinu for ATMEGA2560 -- version #5  (fredcw)  sáb 19 out 2024 19:45:58 -03
diff --git a/lib/avr_messages.c b/lib/avr_messages.c
index 729871c..025fa18 100644
--- a/lib/avr_messages.c
+++ b/lib/avr_messages.c
@@ -4,7 +4,7 @@
 typedef unsigned int size_t;
 #include <avr/pgmspace.h>

-const __flash char sysinit_m0[] = "\nWelcome to Xinu!\n\n\r\tXinu OS Copyright (c) 2012, 2015\n\r\tDouglas E. Comer and CRC Press, Inc.\n\n\r\tXinu OS for AVR atmega328p v0.1 (c) 2020\n\r\tRafael Ignacio Zurita <rafa@fi.uncoma.edu.ar>\n\n\r";
+const __flash char sysinit_m0[] = "\nWelcome to Xinu!\n\n\r\tXinu OS Copyright (c) 2012, 2015\n\r\tDouglas E. Comer and CRC Press, Inc.\n\n\r\tXinu OS for AVR atmega2560 v0.1a (c) 2020\n\r\tRafael Ignacio Zurita <rafa@fi.uncoma.edu.ar>\nMod by fredcw@gmail.com\n\n\r";
 const __flash char m1[] = "\n\nRecreating shell\n\n";
 const __flash char m2[] = "Out of message nodes";
 const __flash char m3[] = "\n\nAll user processes have completed.\n\n";
diff --git a/main/xsh_memdump.c b/main/xsh_memdump.c
index 136f26c..8f9da6c 100644
--- a/main/xsh_memdump.c
+++ b/main/xsh_memdump.c
@@ -21,7 +21,8 @@ shellcmd xsh_memdump(int nargs, char *args[])
 {

    int from = 0;
-   int to = 0x8FF;     /* AVR atmega328p top RAM address */
+   // int to = 0x8FF;      /* AVR atmega328p top RAM address */
+   int to = 0x1FFF;        /* AVR atmega2560 top RAM address */

    if (nargs == 3) {
        from = args[1];
diff --git a/system/meminit.c b/system/meminit.c
index 6e83fa9..11c484c 100644
--- a/system/meminit.c
+++ b/system/meminit.c
@@ -45,7 +45,11 @@ void meminit(void)
    /* Initialize the minheap and maxheap variables */

    minheap = ptr_bss_end+1;
-   maxheap = 0x008008FF;   /* AVR atmega328p stack pointer when booting */
+   // maxheap = 0x008008FF;    /* AVR atmega328p stack pointer when booting */
+   // maxheap = 0x00801FFF;    /* AVR atmega2560 stack pointer when booting */
+        //  Maskout .data memory base addres  and add 0x200 start internal RAM address of 2560 
+   //  and 8K memory -->> 
+   maxheap = (ptr_bss_end & 0x00800000) + 0x00000200 + 0x00001FFF;

    /* Initialize the memory list as one big block */