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25.7.4.6 SD Read Sector Procedure in Raw Mode In raw mode the booting image can be located at one of the four consecutive locations in the main area: offset 0/20000h (128KB)/40000h (256KB)/60000h (384KB). For this reason a booting image shall not exceed 128KB in size. However it is possible to flash a device with an image greater than 128KB starting at one of the aforementioned locations. Therefore the ROM Code does not check the image size. The only drawback is that the image will cross the subsequent image boundary. The raw mode is detected by reading sectors #0, #256, #512, #768. The content of these sectors is then verified for presence of a TOC structure as described in Section 25.10. The Configuration Header (CH) must be located in the first sector followed by a header. The CH might be void (only containing a CHSETTINGS item for which the Valid field is zero).
