s3c2410内核的起始地址
* swapper_pg_dir is the virtual address of the initial page table.
本文引用地址：//m.amcfsurvey.com/article/201611/317275.htm* We place the page tables 16K below KERNEL_RAM_VADDR.Therefore, we must
* make sure that KERNEL_RAM_VADDR is correctly set.Currently, we expect
* the least significant 16 bits to be 0x8000, but we could probably
* relax this restriction to KERNEL_RAM_VADDR >= PAGE_OFFSET + 0x4000.
大致的意思是，在KERNEL_RAM_VADDR（内核的在RAM中的地址）下面16K（16bit，也就是说是32Kb，0x8000）的地方放着初始化页表的虚拟地址，因此至少在RAM的起始地址还有偏移0x8000才能开始放内核。
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