doc/Host-tools-overview: tiffs-mkfs description updated The first version of tiffs-mkfs did not include a journal file in the created FFS, expecting the firmware to create it on first boot. All historical firmwares prior to a recent FC fix (2020-05) contain a bug in that code path, thus images made with the first version of tiffs-mkfs were only acceptable to very recent FC firmwares. tiffs-mkfs has now been extended to include an empty journal in the created FFS, thus the restriction of working with recent fw only has been lifted.

	.text
	.code	32
	.globl	memcpy32
memcpy32:
1:	subs	r2, r2, #4
	ldrcs	r3, [r1], #4
	strcs	r3, [r0], #4
	bhi	1b
	bx	lr