Sansa Connect: change bootloader linker file

This change ensures that Sansa Connect bootloader.bin will fit in its flash
partition.

Fix _flash_sizem calculation, division was not working properly because
FLASHSIZE included subtraction and defined value was not in parenthesis.
Prior to this change _flash_sizem was 0x00800000, now it is correctly set
to 4 in case of Sansa Connect and 8 in case of other TMS320DM320 players.
This significantly improves boot time as cache is now enabled only for
real flash memory region.

Change-Id: If3e50a3075c840dcb69dfafe5bba608a0acd2bf8

2 files changed, 14 insertions, 7 deletions

diff --git a/firmware/target/arm/tms320dm320/boot.lds b/firmware/target/arm/tms320dm320/boot.lds
index 43ed6486e9..c59cc7f514 100644
--- a/firmware/target/arm/tms320dm320/boot.lds
+++ b/firmware/target/arm/tms320dm320/boot.lds
@@ -34,6 +34,8 @@ STARTUP(target/arm/tms320dm320/crt0.o)
 #define IRAMORIG    0x00000000
 #define IRAMSIZE    0x4000
 
+#define FLASHORIG   0x00100000
+
 #ifdef SANSA_CONNECT
 /* Offset in flash from beginning, we don't want overwrite OF bootloader
    due to recovery mode and more importantly - hardware block protection.
@@ -41,15 +43,18 @@ STARTUP(target/arm/tms320dm320/crt0.o)
    In .srr file header add any valid memory address from following
    <0x1000000; 0x1300180) u (0x131EAF4; 0x1420000) u (0x1440000; 0x5000000>
    ensuring that complete bootloader fits in.
-   Entry point in .srr file should be 0x120010. */
-#define FLASHOFFSET 0x20010
+   Entry point in .srr file should be equal to _loadaddress. */
+#define FLASHSIZE     0x00400000
+#define FLASHMEMORIG  0x00120010
+/* Kernel partition is 2 M, srr header is 16 bytes, sig is 2048 bytes */
+#define FLASHMEMSIZE  0x001FF7F0
 #else
-#define FLASHOFFSET 0
+/* On targets other than Sansa Connect use whole flash for bootloader */
+#define FLASHSIZE     0x00800000
+#define FLASHMEMORIG   FLASHORIG
+#define FLASHMEMSIZE   FLASHSIZE
 #endif
 
-#define FLASHORIG   0x00100000
-#define FLASHSIZE   0x00800000-FLASHOFFSET
-
 PRO_STACK_SIZE =  0x2000;
 IRQ_STACK_SIZE =  0x400;
 FIQ_STACK_SIZE =  0x400;
@@ -61,7 +66,7 @@ MEMORY
 {
    DRAM : ORIGIN = DRAMORIG, LENGTH = DRAMSIZE
    IRAM : ORIGIN = IRAMORIG, LENGTH = IRAMSIZE
-   FLASH : ORIGIN = FLASHORIG+FLASHOFFSET, LENGTH = FLASHSIZE
+   FLASH : ORIGIN = FLASHMEMORIG, LENGTH = FLASHMEMSIZE
 }
 
 SECTIONS
diff --git a/firmware/target/arm/tms320dm320/crt0.S b/firmware/target/arm/tms320dm320/crt0.S
index 8351ddbf25..9f2c8dbe04 100644
--- a/firmware/target/arm/tms320dm320/crt0.S
+++ b/firmware/target/arm/tms320dm320/crt0.S
@@ -121,9 +121,11 @@ _start:
     ldr     r2, =_vectorsend
     bl      _copy_section
 
+#if !defined(SANSA_CONNECT)
     /* Add some delay time to make sure JTAG can be accessed cleanly */
     mov     r0, #0x100000
     bl      _delay_cycles
+#endif
 
 #if defined(BOOTLOADER)
     /* Copy the DRAM */