SIM speed enhancement re-enabled and made configurable TI's original code supported SIM speed enhancement, but Openmoko had it disabled, and OM's disabling of speed enhancement somehow caused certain SIM cards to start working which didn't work before (OM's bug #666). Because our FC community is much smaller in year 2020 than OM's community was in their day, we are not able to find one of those #666-affected SIMs, thus the real issue they had encountered remains elusive. Thus our solution is to re-enable SIM speed enhancement and simply wait for if and when someone runs into a #666-affected SIM once again. We provide a SIM_allow_speed_enhancement global variable that allows SIM speed enhancement to be enabled or disabled per session, and an /etc/SIM_spenh file in FFS that allows it to enabled or disabled on a non-volatile basis. SIM speed enhancement is now enabled by default.

	.text
	.code	32
	.globl	_entry

_entry:	adr	r0, vectors
	ldmia	r0, {r1-r7}
	mov	r0, #0x800000
	stmia	r0, {r1-r7}
	ldr	pc, jumpaddr

vectors:
	.word	0x4000
	.word	0x4004
	.word	0x4008
	.word	0x400C
	.word	0x4010
	.word	0x4014
	.word	0x4018
jumpaddr:
	.word	0x4058