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RM0319 데이터시트(PDF) 43 Page - STMicroelectronics

부품명 RM0319
상세설명  SPEAr320S architecture and functionality
PDF  368 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

RM0319 데이터시트(HTML) 43 Page - STMicroelectronics

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RM0319
BootROM
Doc ID 022640 Rev 3
43/368
BootROM code reads the device ID code and looks for it in a table which contains all
supported device codes. Then, it fills a device description structure for page_size,
block_size, memory size and spare command according to this ID code.
After that, it searches for X-Loader in the first page of every block of the Flash starting from
the 1st block to the 4th block. Before reading the block, it checks the sanity by reading the
1st word of the spare area of each block which should be 0xFF. If it not 0xFF, it skips to the
next block.
2.
Read the whole page in a buffer (buffer size equals page size) and search for X-Loader.
If found, return to the start address.
3.
Find the transfer size from the header. Calculate the number of pages and start reading
the pages from the Flash copying them into the shadow memory.
4.
Authenticate X-Loader. If authenticated, jump to the start address, otherwise jump to
USB boot.
5.
While reading, check ECC for every page, read ECC from the NAND memory spare
area and from the FSMC controller. If there is an error of 1 bit, fix it, otherwise you will
get a “Boot failed” message.



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