Booted in QEMU, and on Allwinner D1. Testing on the unleashed board to be performed by @maciphone2_googlemail.com.
With some prints added to `pmap_bootstrap_dmap()`, the ranges are shown to be constructed more accurately:
```
map_bootstrap 275c00000 e9e000
physmap_idx 14
min_pa 80080000
max_pa 280000000
loop 0; pa=0x80080000, endpa=0x27dc00000, va=0xffffffd000080000
384 L3; 511 L2; 6 L1; 494 L2; 0 L3
loop 2; pa=0x27dc01000, endpa=0x27de59000, va=0xffffffd1fdc01000
600 L3
loop 4; pa=0x27de61000, endpa=0x27de69000, va=0xffffffd1fde61000
8 L3
loop 6; pa=0x27de6a000, endpa=0x27de6b000, va=0xffffffd1fde6a000
1 L3
loop 8; pa=0x27de8d000, endpa=0x27eed2000, va=0xffffffd1fde8d000
371 L3; 7 L2; 210 L3
loop 10; pa=0x27eed3000, endpa=0x27f6bd000, va=0xffffffd1feed3000
301 L3; 3 L2; 189 L3
loop 12; pa=0x27f6bf000, endpa=0x280000000, va=0xffffffd1ff6bf000
321 L3; 4 L2; 0 L3
---<<BOOT>>---
...
Physical memory chunk(s):
0x80080000 - 0x27fffffff, 8191 MB (2097024 pages)
Excluded memory regions:
0x275c00000 - 0x276c1afff, 16 MB ( 4123 pages) NoAlloc
0x27dc00000 - 0x27dc00fff, 0 MB ( 1 pages) NoAlloc
0x27de59000 - 0x27de60fff, 0 MB ( 8 pages) NoAlloc
0x27de69000 - 0x27de69fff, 0 MB ( 1 pages) NoAlloc
0x27de6b000 - 0x27de8cfff, 0 MB ( 34 pages) NoAlloc
0x27eed2000 - 0x27eed2fff, 0 MB ( 1 pages) NoAlloc
0x27f6bd000 - 0x27f6befff, 0 MB ( 2 pages) NoAlloc
...
Physical memory chunk(s):
0x0000000080080000 - 0x000000026acc7fff, 8233713664 bytes (2010184 pages)
0x0000000276c1b000 - 0x000000027dbfffff, 117329920 bytes (28645 pages)
0x000000027dc01000 - 0x000000027de58fff, 2457600 bytes (600 pages)
0x000000027de61000 - 0x000000027de68fff, 32768 bytes (8 pages)
0x000000027de6a000 - 0x000000027de6afff, 4096 bytes (1 pages)
0x000000027de8d000 - 0x000000027eed1fff, 17059840 bytes (4165 pages)
0x000000027eed3000 - 0x000000027f6bcfff, 8298496 bytes (2026 pages)
0x000000027f6bf000 - 0x000000027fffffff, 9703424 bytes (2369 pages)
avail memory = 8341520384 (7955 MB)
```
Demonstrate further with read of excluded memory range starting at 0x27de6b000, via `/dev/mem`.
Before:
```
# dd if=/dev/mem bs=1 count=128 of=./outputbytes iseek=0x27de6b000
128+0 records in
128+0 records out
128 bytes transferred in 0.004856 secs (26358 bytes/sec)
```
After:
```
# dd if=/dev/mem bs=1 count=128 of=./outputbytes iseek=0x27de6b000
dd: /dev/mem: Bad address
0+0 records in
0+0 records out
0 bytes transferred in 0.002467 secs (0 bytes/sec)
```