引导地址和引导加载程序问题

所有PIC32设备在0x1FC000启动一定数量的闪存，并且Flash的主体从0x1D10000开始。这些是Flash程序员需要的总线上的物理地址，但是核心使用虚拟地址。KSGE1被取消，是核心开始执行的地方。KSGE0被认为是缓存的，因此地址是0x9d00亿。是的，您可以编写单独的引导加载程序。主要问题是您需要使用多少引导闪存（3K、12K或160K），以便您知道是否必须使用程序闪存。在MPLLABHarmony中有引导加载程序，我建议把它们作为您自己的起点。去年八月，我在我们的MASTERs会议上教了引导加载程序。如果你能用你的电子邮件地址给我发私人信息，我会把幻灯片发给你。



      以下为原文

    All PIC32 devices put some amount of Flash starting at 0x1fc00000, and the main body of Flash starting at 0x1d000000. These are the physical addresses on the bus, which the flash programmer requires, but the core uses virtual address. KSEG1 is uncached, and is where the core starts execution. KSEG0 is considered cached, and so the address is 0x9d000000.
 
Yes, you can write a separate bootloader. The main question will be how much boot flash you have to work with (3K, 12K, or 160K) so you know whether you're going to have to use some program flash with it. There are bootloaders in MPLAB Harmony, and I would suggest looking at them as a starting point for your own.
 
I taught a bootloader course at our MASTERs conference this past August. If you can send me a private message with your email address, I'll send you my slides.

你好，Joseph，正如你提到的，0xbfc00000是引导（设备重置）地址，并且是针对MIPS架构固定的。将引导加载程序代码保存在引导闪存或程序闪存中是可选的。如果引导加载程序适合于引导闪存，则将其保存在引导闪存中，否则将其保存在程序闪存中。这只是不同而已。ce在内存位置，应该通过引导加载程序的链接器脚本正确地链接它。您可以按照应用程序说明AN1388进行操作，AN1388为初学者提供了良好的信息和演示。



      以下为原文

    Hi Joseph,
 
As you mentioned, 0xbfc00000 is the boot(device reset) address and is fixed for MIPS architecture.
Keeping bootloader code in boot flash or program flash is optional.
If a bootloader fits into bootflash memory, keep it in boot flash other wise keep it in program flash.
It's is just a difference in memory location, that should be linked properly by linker script of your bootloader.
 
You can follow application note AN1388, which has good information and demos for beginners.

嘿，Totem，谢谢你的回答。但我还没有完全明白。设备复位地址在启动闪光灯，对不对？如果将引导加载程序放在程序Flash中，将在重置时运行什么？我会读的。再次感谢您。



      以下为原文

    Hey Totem, 
 
Thank you for your answer. But I still don't completely get it. The device reset address is in the boot flash right? If you place the bootloader in program flash, what will run at reset? I will read that AN. Thank you once again.

在PIC32 MX575 F512L中，我们有512K闪存+12K引导闪存，但是由于我的引导加载程序代码大于12K，所以我们使用了6K的512K闪存来引导引导代码。但是如何将12 K引导闪存作为程序存储器重用。这是可能的



      以下为原文

    In pic32mx575f512l we have 512k flash + 12k boot flash,
But since my bootloader code is more than 12k , we used 60k of 512k flash for bootloader code.
but how can i reuse 12 k boot flash as program memory. it' possible