From 60e2cd6de946c0c473c0e9bfde5b7b1d47a5b28f Mon Sep 17 00:00:00 2001
From: Tomasz Moń <desowin@gmail.com>
Date: Thu, 8 Jul 2021 18:23:18 +0200
Subject: DM320: Regorganize LCD and TTB memory layout

Do not introduce any change for M:Robe 500 as it uses the two LCD frames
in non-obvious way.

Sansa Connect and Creative ZVM use only single front framebuffer.
Place TTB at DRAM end to minimize memory loss due to alignment.
Reserve as little as possible memory for the LCD frames.
On Sansa Connect this change extends audio buffer by 858 KiB.

Change-Id: I21bdeec4cfba86d71803a39acd651a87e73767e6
---
 firmware/target/arm/tms320dm320/boot.lds | 60 +++++++++++++++++++++-----------
 1 file changed, 40 insertions(+), 20 deletions(-)

(limited to 'firmware/target/arm/tms320dm320/boot.lds')

diff --git a/firmware/target/arm/tms320dm320/boot.lds b/firmware/target/arm/tms320dm320/boot.lds
index 2db687d533..8b075f43df 100644
--- a/firmware/target/arm/tms320dm320/boot.lds
+++ b/firmware/target/arm/tms320dm320/boot.lds
@@ -14,22 +14,28 @@ STARTUP(target/arm/tms320dm320/crt0.o)
 #define LCD_NATIVE_HEIGHT LCD_HEIGHT
 #endif
 
-#define LCD_FUDGE       LCD_NATIVE_WIDTH%32
-
-#define LCD_BUFFER_SIZE  ((LCD_NATIVE_WIDTH+LCD_FUDGE)*LCD_NATIVE_HEIGHT*2)
-
 /* must be 16Kb (0x4000) aligned */
 #define TTB_SIZE         (0x4000)
 
+/* Bootloader only uses/knows about the upper 32 M */
+#define DRAMSIZE    (MEMORYSIZE * 0x100000 / 2)
+#define DRAMORIG    CONFIG_SDRAM_START+DRAMSIZE
+
+#ifdef MROBE_500
+#define LCD_FUDGE       LCD_NATIVE_WIDTH%32
+#define LCD_BUFFER_SIZE ((LCD_NATIVE_WIDTH+LCD_FUDGE)*LCD_NATIVE_HEIGHT*2)
 /* Give this some memory to allow it to align to the MMU boundary.
  * Note that since there are two buffers (YUV/RGB) it calculates the approximate
  * memory needed in steps of 1 Meg.
  */
-#define LCD_TTB_AREA    0x100000*((LCD_BUFFER_SIZE>>19)+1)
-
-/* Bootloader only uses/knows about the upper 32 M */
-#define DRAMORIG    CONFIG_SDRAM_START+0x02000000
-#define DRAMSIZE    (MEMORYSIZE * 0x80000)
+#define LCD_TTB_AREA    (0x100000*((LCD_BUFFER_SIZE>>19)+1))
+/* End of the audio buffer, where the codec buffer starts */
+#define TTB_BEGIN       (DRAMORIG + DRAMSIZE - LCD_TTB_AREA)
+#else
+#define LCD_BUFFER_SIZE (LCD_NATIVE_WIDTH*LCD_NATIVE_HEIGHT*2)
+#define LCD_TTB_AREA    (TTB_SIZE + LCD_BUFFER_SIZE)
+#define LCD_BEGIN       (DRAMORIG + DRAMSIZE - LCD_TTB_AREA)
+#endif
 
 #define IRAMORIG    0x00000000
 #define IRAMSIZE    0x4000
@@ -59,9 +65,6 @@ PRO_STACK_SIZE =  0x2000;
 IRQ_STACK_SIZE =  0x400;
 FIQ_STACK_SIZE =  0x400;
 
-/* End of the audio buffer, where the codec buffer starts */
-#define TTB_BEGIN   (DRAMORIG + DRAMSIZE - LCD_TTB_AREA)
-
 MEMORY
 {
    DRAM : ORIGIN = DRAMORIG, LENGTH = DRAMSIZE
@@ -148,7 +151,7 @@ SECTIONS
     } > IRAM AT> FLASH
 
     _iramcopy = LOADADDR(.iram);
-    
+
     .ibss (NOLOAD) :
     {
         . = ALIGN(0x4);
@@ -158,12 +161,12 @@ SECTIONS
     } > IRAM
 
     /* Program stack space */
-    .pro_stack (NOLOAD): 
+    .pro_stack (NOLOAD):
     {
         . = ALIGN(0x4);
         *(.stack)
         stackbegin = .;        /* Variable for thread.c */
-        _pro_stack_end = .;       
+        _pro_stack_end = .;
         . += PRO_STACK_SIZE;
         _pro_stack_start = .;
         stackend = .;          /* Variable for tread.c */
@@ -186,28 +189,45 @@ SECTIONS
         . += FIQ_STACK_SIZE;
         _fiq_stack_start = .;
     } > IRAM
-    
+
+#ifdef MROBE_500
     .ttbtable TTB_BEGIN (NOLOAD) :
     {
         . = ALIGN (0x4000);
         _ttbstart = .;
         . += TTB_SIZE;
     } > DRAM
-    
+
     /* The LCD buffer should be at the end of memory to protect against
-     * overflowing something else when the YUV blitter is fudging the screen 
+     * overflowing something else when the YUV blitter is fudging the screen
      * size.
      */
-    
+
     .lcdbuffer (NOLOAD) :
     {
         _lcdbuf = .;
         . += LCD_BUFFER_SIZE;
     } > DRAM
-    
+
     .lcdbuffer2 (NOLOAD) :
     {
         _lcdbuf2 = .;
         . += LCD_BUFFER_SIZE;
     } > DRAM
+#else
+    .lcdbuffer LCD_BEGIN (NOLOAD) :
+    {
+        . = ALIGN(32);
+        _lcdbuf = .;
+        . += LCD_BUFFER_SIZE;
+    } > DRAM
+
+    /* Place TTB at the end of RAM to minimize alignment losses */
+    .ttbtable (NOLOAD) :
+    {
+        . = ALIGN (0x4000);
+        _ttbstart = .;
+        . += TTB_SIZE;
+    } > DRAM
+#endif
 }
-- 
cgit v1.2.3