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*Finally* added spiflash info.
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== Boot ROM ==
== Boot ROM ==
Upon boot, parts of the ARM9 and ARM11 boot ROMs are protected by writing to [[CONFIG#CFG_SYSPROT9|CFG_SYSPROT9]] and [[CONFIG#CFG_SYSPROT11|CFG_SYSPROT11]], respectively. The non-protected areas of the ARM9 and ARM11 boot ROMs are identical for launch-day regular Old3DS, 2DS, and regular New3DS.
Upon boot, parts of the ARM9 and ARM11 boot ROMs are protected by writing to [[CONFIG#CFG_SYSPROT9|CFG_SYSPROT9]] and [[CONFIG#CFG_SYSPROT11|CFG_SYSPROT11]], respectively. The non-protected areas of the ARM9 and ARM11 boot ROMs are identical for launch-day regular Old3DS, 2DS, and regular New3DS.
+
+== Non-NAND FIRM boot ==
+Boot9 can also boot from non-NAND. For this a different set of RSA pubks are used(separate pubks for retail/devunit like NAND). The spiflash FIRM image for this is also encrypted with AES-CTR using a normalkey stored in prot_boot9(separate for retail/devunit). This encryption is basically used instead of what is used for NAND-firm-partitions.
+
+ CTR_word[0] = firmimageoffset;
+ CTR_word[1] = outbufaddr;
+ CTR_word[2] = readsize;
+ CTR_word[3] = readsize;
+
+When booting from NAND fails, boot9 will then attempt to boot from Wifi SPI-flash(this only triggers when the wifi module hw is properly accessible/connected, which is normally the case). The base offset for spiflash FIRM is 0x400. Note that this region is write-protected by the spiflash.
== Boot Procedure ==
== Boot Procedure ==