RT1052 BootLoader总结
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概述
Bootloader涉及到的RT1052单片机资源有:Cache,ram,外部SDRAM,ARM7汇编指令,外部dataFlash.
升级功能涉及到的其他功能有:服务器存贮和传输升级Bin文件;上位机接收和发送BiN文件;判断升级是否成功和提示。
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流程图
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app程序与Bootloader程序不同的地方总结如下
3.1 xxx.s启动文件增加了如下区域
AREA |.ram_vtor_table|, DATA, READONLY
IMPORT |Image$$ARM_LIB_STACK$$ZI$$Limit|
R_Vectors DCD |Image$$ARM_LIB_STACK$$ZI$$Limit| ; Top of Stack
DCD Reset_Handler ; Reset Handler
DCD NMI_Handler ;NMI Handler
《MIMXRT1052xxxxx_flexspi_nor_sdram.scf》
#define m_itcm_vectors_start 0x00000000
#define m_itcm_vectors_size 0x00000400
#define m_itcm_start 0x00000400
#define m_itcm_size 0x0001FC00
RW_vectors_data m_itcm_vectors_start m_itcm_vectors_size { ; RW data
startup_MIMXRT1052.o (.ram_vtor_table)
}
ARM_LIB_HEAP +0 EMPTY Heap_Size { ; Heap region growing up
}
ARM_LIB_STACK m_data_start+m_data_size EMPTY -Stack_Size { ; Stack region growing down
}
3.2 evkbimxrt1050_flexspi_nor.ini更改SP,PC
SP = _RDWORD(0x60008000); // Setup Stack Pointer
PC = _RDWORD(0x60008004); // Setup Program Counter
_WDWORD(0xE000ED08, 0x60008000); // Setup Vector Table Offset Register
3.3 ***.scf分散加载文件更改
#define m_interrupts_start 0x60008000
#define m_interrupts_size 0x00000400
3.4 target-->user,生成Bin,命令。
RUN1:fromelf.exe --bincombined --bincombined_base=0x60008000 --output "[email protected]" "[email protected]"
RUN2:fromelf.exe --m32 --output "[email protected]" "#L"
3.5 Linker:设置改变:
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--remove
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--keep=*(.boot_hdr.ivt)
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--keep=*(.boot_hdr.boot_data)
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--keep=*(.boot_hdr.dcd_data)
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--keep=*(.boot_hdr.conf)
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--keep=*(NonCacheable)
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--keep=*(m_usb_dma_init_data)
--predefine="-DXIP_BOOT_HEADER_ENABLE=1"
改为:
--remove
--keep=*(.ram_vtor_table)
--predefine="-DXIP_BOOT_HEADER_ENABLE=1"
3.6应用程序初始化里面的SDRAM的初始化一定要去掉!!
// /* Set SEMC_PODF. */
// CLOCK_SetDiv(kCLOCK_SemcDiv, 7);
// /* Set Semc alt clock source. */
// CLOCK_SetMux(kCLOCK_SemcAltMux, 0);
// /* Set Semc clock source. */
// CLOCK_SetMux(kCLOCK_SemcMux, 0);
3.8 Main函数里面:增加
__disable_irq();
SCB->VTOR = 0x00000000; //Enable ITCM Vectors Table
__enable_irq();
4.0 keil报错处理:"flexspi_nor_debug\CGAaxf.out": Error: Q0471E: Base address 0x60008000 is above start address 0x60000000 of load region #0
处理办法: 删掉输出文件夹里面的*.bin文件。
4.1需要深入研究的地方有:
__ISB();
__DSB();
/* Enable I cache and D cache */
SCB_DisableDCache();
SCB_DisableICache();
vControlSwitch();
已经确认,vControlSwitch();之前,必须关闭cache。创造一个干净的环境。
Bootloader打印信息如下:
Start xmodem1k client.
App SP:0x81d00000.
App PC:0x6000863d.
mcu ready to recv data...
CCCCCCCCCCCCCCCCCCCC
Wait timeout,Jump App.
------------------------------------------
App SP:0x81d00000.
App PC:0x60008415.
mcu ready to recv data...
Wait timeout,Jump App.
------------------------------------------
20181217 TWO int main2(void) : 0x6000a6b5.
PC:0x6000a6b5
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