See the top level README file for more information on documentation
and how to run these programs.

Derived from bootloader07.  This is a skeleton for building generic
uart based programs.

Starting with the Raspberry Pi 2 the peripheral base is now at
0x3F000000 instead of 0x20000000 so in periph.c you need to uncomment
the correct header file before building.

Yes I did some self modifying code in there to make it easier to dump
some registers of interest.  In particular the MIDR (Main Identification
Register).  Which helps you figure out which ARM core you are using.
The RPi 2 uses a Cortex-A7 r0p5 in the BCM2836, the predecessors to the
RPi2 use an ARM1176JZF-S the one I have on hand which is a model A (not
A+) has a r0p7 as shown below.

Raspberry Pi 2

00000000 410FC075 MIDR
00000001 84448003 CTR
00000002 00000000 TCMTR
00000003 00000000 TLBTR
00000004 410FC075 MIDR alias
00000005 80000F00 MPIDR
00000006 00000000 REVIDR
00000007 410FC075 MIDR alias
00000000 00001131 ID_PFR0
00000001 00011011 ID_PFR1
00000002 02010555 ID_DFR0
00000003 00000000 ID_AFR0
00000004 10101105 ID_MMFR0
00000005 40000000 MD_MMFR1
00000006 01240000 ID_MMFR2
00000007 02102211 ID_MMFR3
00000000 02101110 ID_ISAR0 *
00000001 13112111 ID_ISAR1
00000002 21232041 ID_ISAR2
00000003 11112131 ID_ISAR3
00000004 10011142 ID_ISAR4
00000005 00000000 ID_ISA45

rpi1     rpi2
410FB767 410FC075 MRC p15, 0, r0, c0, c0, 0
1D152152 84448003 MRC p15, 0, r0, c0, c0, 1
00000000 00000000 MRC p15, 0, r0, c0, c0, 2
00000800 00000000 MRC p15, 0, r0, c0, c0, 3
410FB767 410FC075 MRC p15, 0, r0, c0, c0, 4
410FB767 80000F00 MRC p15, 0, r0, c0, c0, 5
410FB767 00000000 MRC p15, 0, r0, c0, c0, 6
410FB767 410FC075 MRC p15, 0, r0, c0, c0, 7
00000111 00001131 MRC p15, 0, r0, c0, c1, 0
00000011 00011011 MRC p15, 0, r0, c0, c1, 1
00000033 02010555 MRC p15, 0, r0, c0, c1, 2
00000000 00000000 MRC p15, 0, r0, c0, c1, 3
01130003 10101105 MRC p15, 0, r0, c0, c1, 4
10030302 40000000 MRC p15, 0, r0, c0, c1, 5
01222100 01240000 MRC p15, 0, r0, c0, c1, 6
00000000 02102211 MRC p15, 0, r0, c0, c1, 7
00140011 02101110 MRC p15, 0, r0, c0, c2, 0
12002111 13112111 MRC p15, 0, r0, c0, c2, 1
11231121 21232041 MRC p15, 0, r0, c0, c2, 2
01102131 11112131 MRC p15, 0, r0, c0, c2, 3
00001141 10011142 MRC p15, 0, r0, c0, c2, 4
00000000 00000000 MRC p15, 0, r0, c0, c2, 5