Hi,
I am developing custom bootloader for 28035. I have created two different projects, one for bootloader and another for the app. I am able to run both. The bootloader is in sector A, while other sectors are for Flash. Both the application are running from flash.
When I use the debugger, I noticed that bootloader is able to jump to the main app and the main app runs just fine after that. But when I reset the board, I noticed bootloader is executing but the app does not run.
I tried some other way and found that If I use the function pointer to jump to the main app, it works fine. But I don't think it is a right way to do it as it will not rest the stack and all other registers.
For bootloader, I used the flash kernel example from the controlsuit.
/*******Bootloader Linker**********
PAGE 0:
progRAM : origin = 0x008000, length = 0x001000 /* on-chip RAM (L0-L2)*/
OTP : origin = 0x3D7800, length = 0x000400 /* on-chip OTP */
FLASHH : origin = 0x3E8000, length = 0x004000 /* on-chip FLASH */
// FLASHG : origin = 0x3EA000, length = 0x002000 /* on-chip FLASH */
FLASHF : origin = 0x3EC000, length = 0x002000 /* on-chip FLASH */
FLASHE : origin = 0x3EE000, length = 0x002000 /* on-chip FLASH */
FLASHD : origin = 0x3F0000, length = 0x002000 /* on-chip FLASH */
FLASHC : origin = 0x3F2000, length = 0x002000 /* on-chip FLASH */
FLASHA : origin = 0x3F6000, length = 0x001F80 /* on-chip FLASH */
CSM_RSVD : origin = 0x3F7F80, length = 0x000076 /* Part of FLASHA. Program with all 0x0000 when CSM is in use. */
BEGIN : origin = 0x3F7FF6, length = 0x000002 /* Part of FLASHA. Used for "boot to Flash" bootloader mode. */
CSM_PWL : origin = 0x3F7FF8, length = 0x000008 /* Part of FLASHA. CSM password locations in FLASHA */
SECTIONS
{
/* Allocate program areas: */
codestart : > BEGIN, PAGE = 0
ramfuncs : LOAD = FLASHA,
RUN = progRAM,
LOAD_START(_RamfuncsLoadStart),
LOAD_END(_RamfuncsLoadEnd),
RUN_START(_RamfuncsRunStart),
PAGE = 0
.text : > FLASHA, PAGE = 0
.InitBoot : > FLASHA, PAGE = 0
.cinit : > FLASHA, PAGE = 0
.pinit : > FLASHA, PAGE = 0
.switch : > FLASHA, PAGE = 0
.reset : > FLASHA, PAGE = 0, TYPE = DSECT /* not used, */
csmpasswds : > CSM_PWL PAGE = 0
csm_rsvd : > CSM_RSVD PAGE = 0
/* Allocate uninitalized data sections: */
.stack : > RAMM0, PAGE = 1
.ebss : > dataRAM, PAGE = 1
.esysmem : > dataRAM, PAGE = 1
/*****Main app Linker*************
PAGE 0:
progRAM : origin = 0x008000, length = 0x001000 /* on-chip RAM (L0-L2)*/
OTP : origin = 0x3D7800, length = 0x000400 /* on-chip OTP */
FLASHH : origin = 0x3E8002, length = (0x006000 - 0x2) /* on-chip FLASH */
// FLASHG : origin = 0x3EA000, length = 0x002000 /* on-chip FLASH */
// FLASHF : origin = 0x3EC000, length = 0x002000 /* on-chip FLASH */
FLASHE : origin = 0x3EE000, length = 0x002000 /* on-chip FLASH */
FLASHD : origin = 0x3F0000, length = 0x002000 /* on-chip FLASH */
FLASHC : origin = 0x3F2000, length = 0x002000 /* on-chip FLASH */
// FLASHA : origin = 0x3F6000, length = 0x001F80 /* on-chip FLASH */
CSM_RSVD : origin = 0x3F7F80, length = 0x000076 /* Part of FLASHA. Program with all 0x0000 when CSM is in use. */
BEGIN : origin = 0x3E8000, length = 0x000002 /* Part of FLASHA. Used for "boot to Flash" bootloader mode. */
CSM_PWL : origin = 0x3F7FF8, length = 0x000008 /* Part of FLASHA. CSM password locations in FLASHA */
IQTABLES : origin = 0x3FE000, length = 0x000B50 /* IQ Math Tables in Boot ROM */
IQTABLES2 : origin = 0x3FEB50, length = 0x00008C /* IQ Math Tables in Boot ROM */
IQTABLES3 : origin = 0x3FEBDC, length = 0x0000AA /* IQ Math Tables in Boot ROM */
BOOTROM : origin = 0x3FF27C, length = 0x000D44 /* Boot ROM */
RESET : origin = 0x3FFFC0, length = 0x000002 /* part of boot ROM */
VECTORS : origin = 0x3FFFC2, length = 0x00003E /* part of boot ROM */
PAGE 1 :
BOOT_RSVD : origin = 0x000000, length = 0x000050 /* Part of M0, BOOT rom will use this for stack */
RAMM0 : origin = 0x000050, length = 0x0007B0 /* on-chip RAM block M0 */
// RAMM1 : origin = 0x000400, length = 0x000400 /* on-chip RAM block M1 */
dataRAM : origin = 0x009000, length = 0x001000 /* data RAM (L3) */
FLASHB : origin = 0x3F4000, length = 0x002000 /* on-chip FLASH */
CLA_CPU_MSGRAM : origin = 0x001480, length = 0x000080 /* CLA-R/W, CPU-R message RAM */
CPU_CLA_MSGRAM : origin = 0x001500, length = 0x000080 /* CPU-R/W, CLA-R message RAM */
}
SECTIONS
{
/* Allocate program areas: */
.cinit : > FLASHH, PAGE = 0
.pinit : > FLASHH, PAGE = 0
.text : > FLASHH, PAGE = 0
codestart : > BEGIN PAGE = 0
ramfuncs : LOAD = FLASHD,
RUN = progRAM,
LOAD_START(_RamfuncsLoadStart),
LOAD_END(_RamfuncsLoadEnd),
RUN_START(_RamfuncsRunStart),
PAGE = 0
csmpasswds : > CSM_PWL PAGE = 0
csm_rsvd : > CSM_RSVD PAGE = 0
/* Allocate uninitalized data sections: */
.stack : > RAMM0, PAGE = 1
.ebss : > dataRAM, PAGE = 1
.esysmem : > dataRAM, PAGE = 1
/**************************
In the bootlaoder code,
return SCI_Boot(); does not work wihtout JTAG.
But (*((void(*)(void))AppEntryAddr))(); works.
