Altera SoC Embedded Design Suite - Manual (Page 184)

Output Image Layout
Base Address
You must place the preloader image at 0x0 for NAND and QSPI flash. The SD/MMC flash has a MBR that
points to a specific offset at the start of the partition. The partition is of type 0xA2, a custom raw partition
type without any file system. The preloader image tool always places the output image at the start of the
output binary file, regardless of the target flash memory type. The flash programming tool is responsible
for placing the image at the desired location on the flash memory device.
Related Information
• Cyclone V Device Handbook, Appendix A: Booting and Configuration
For more information, refer to the Booting and Configuration appendix in volume 3 of the Cyclone V
Device Handbook.
• Arria V Device Handbook, Appendix A: Booting and Configuration
For more information, refer to the Booting and Configuration appendix in volume 3 of the Arria V
Device Handbook.
Size
A single preloader has a 60 KB image size. You can store up to four preloader images in flash. If the boot
ROM does not find a valid preloader image at the first location, it attempts to read an image from the next
location, 64 KB above the first. To take advantage of this feature, program four preloader images in flash
at consecutive 64 KB intervals.
Related Information
• Cyclone V Device Handbook, Appendix A: Booting and Configuration
For information about how the boot ROM loads preloader images, refer to "Boot ROM Flow" in the
Booting and Configuration appendix in volume 3 of the Cyclone V Device Handbook.
• Arria V Device Handbook, Appendix A: Booting and Configuration
For information about how the boot ROM loads preloader images, refer to "Boot ROM Flow" in the
Booting and Configuration appendix in volume 3 of the Arria V Device Handbook.
Address Alignment
Every preloader image aligns to a 64 KB boundary at offsets 0x0, 0x10000, 0x20000, and 0x30000, except
for the NAND flash. Version 0 of the boot ROM assumes that all preloader images in flash memory align
to 64 KB boundaries, except in the case of NAND flash.
If the preloader images are stored in NAND flash with an erasable block size larger than 64 KB, preloader
images are aligned to the block size.
The preloader image tool is unaware of the target flash memory type. If you do not specify the block size,
the default is 64 KB.
NAND Flash
Each preloader image occupies an integer number of blocks. A block is the smallest entity that can be
erased, so updates to a particular boot image does not impact the other images. The size of a single
preloader image sizing is either 64 KB or the NAND flash block size, whichever is larger. For example, if a
NAND block is 32 KB or 64 KB, a single preloader image size is 64 KB; if a NAND block is 128 KB, a
single preloader image size is 128 KB.
ug-1137
2013.05.03
Output Image Layout 7-19
HPS Preloader User Guide Altera Corporation
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