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Linux ÄÚºËÆô¶¯·ÖÎö
1.       ÄÚºËÆô¶¯µØÖ·
1.1.   Ãû´Ê½âÊÍ
ZTEXTADDR
½âѹ´úÂëÔËÐеĿªÊ¼µØÖ·¡£Ã»ÓÐÎïÀíµØÖ·ºÍÐéÄâµØÖ·Ö®·Ö£¬ÒòΪ´ËʱMMU´¦ÓڹرÕ״̬¡£Õâ¸öµØÖ·²»Ò»¶¨Ê±RAMµÄµØÖ·£¬¿ÉÒÔÊÇÖ§³Ö¶ÁдѰַµÄflashµÈ´æ´¢Öн顣
Start address of decompressor. here's no point in talking about
virtual or physical addresses here, since the MMU will be off at the
time when you call the decompressor code. You normally call   the
kernel at this address to start it booting. This doesn't have to be
located in RAM, it can be in flash or other read-only or     
read-write addressable medium.
ZRELADDR
       ÄÚºËÆô¶¯ÔÚRAMÖеĵØÖ·¡£Ñ¹ËõµÄÄÚºËÓ³Ïñ±»½âѹµ½Õâ¸öµØÖ·£¬È»ºóÖ´ÐС£
This is the address where the decompressed kernel will be written,
and eventually executed. The following constraint must be valid:
              __virt_to_phys(TEXTADDR) == ZRELADDR
       The initial part of the kernel is carefully coded to be position independent.
TEXTADDR
       ÄÚºËÆô¶¯µÄÐéÄâµØÖ·£¬ÓëZRELADDRÏà¶ÔÓ¦¡£Ò»°ãÄÚºËÆô¶¯µÄÐéÄâµØַΪRAMµÄµÚÒ»¸öbankµØÖ·¼ÓÉÏ0x8000¡£
       TEXTADDR = PAGE_OFFSET + TEXTOFFST
       Virtual start address of kernel, normally PAGE_OFFSET +
0x8000.This is where the kernel image ends up.  With the latest
kernels, it must be located at 32768 bytes into a 128MB region. 
Previous kernels placed a restriction of 256MB here.
TEXTOFFSET
       ÄÚºËÆ«ÒƵØÖ·¡£ÔÚarch/arm/makefileÖÐÉ趨¡£
PHYS_OFFSET
       RAMµÚÒ»¸öbankµÄÎïÀíÆðʼµØÖ·¡£
Physical start address of the first bank of RAM.
PAGE_OFFSET
RAMµÚÒ»¸öbankµÄÐéÄâÆðʼµØÖ·¡£
       Virtual start address of t


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