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Documentation / arm / SH-Mobile / zboot-rom-mmcif.txt




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Based on kernel version 3.13. Page generated on 2014-01-20 22:00 EST.

1	ROM-able zImage boot from MMC
2	-----------------------------
3	
4	An ROM-able zImage compiled with ZBOOT_ROM_MMCIF may be written to MMC and
5	SuperH Mobile ARM will to boot directly from the MMCIF hardware block.
6	
7	This is achieved by the mask ROM loading the first portion of the image into
8	MERAM and then jumping to it. This portion contains loader code which
9	copies the entire image to SDRAM and jumps to it. From there the zImage
10	boot code proceeds as normal, uncompressing the image into its final
11	location and then jumping to it.
12	
13	This code has been tested on an AP4EB board using the developer 1A eMMC
14	boot mode which is configured using the following jumper settings.
15	The board used for testing required a patched mask ROM in order for
16	this mode to function.
17	
18	   8 7 6 5 4 3 2 1
19	   x|x|x|x|x| |x|
20	S4 -+-+-+-+-+-+-+-
21	    | | | | |x| |x on
22	
23	The zImage must be written to the MMC card at sector 1 (512 bytes) in
24	vrl4 format. A utility vrl4 is supplied to accomplish this.
25	
26	e.g.
27		vrl4 < zImage | dd of=/dev/sdX bs=512 seek=1
28	
29	A dual-voltage MMC 4.0 card was used for testing.
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