Hardware
CPUID to arch: https://github.com/mer-tools/oprofile/blob/master/libop/op_hw_specific.h#L119
CPU flags meaning: http://unix.stackexchange.com/questions/43539/what-do-the-flags-in-proc-cpuinfo-mean
https://www.cs.umd.edu/class/sum2003/cmsc311/Notes/Data/endian.html
In big endian, you store the most significant byte(MSB) in the smallest address.
In little endian, you store the least significant byte(LSB) in the smallest address
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https://software.intel.com/en-us/articles/uefi-shell
map # list disks
help bcfg
VESA (Video Electronics Standards Association)
https://en.wikipedia.org/wiki/List_of_device_bit_rates
|Technology|Rate||Year| |---|---|---| |ISA 16-Bit/8.33 MHz|66.7 Mbit/s|8.33 MB/s|1984 (created)| |I²C|3.4 Mbit/s|425 kB/s|1992 (standardized)| |Low Pin Count|125 Mbit/s|15.63 MB/s [x]|2002| |HyperTransport 3.1 (3.2 GHz, 32-pair)|409.6 Gbit/s|51.2 GB/s|2008| |Unified Media Interface 2.0 (UMI 2.0; ×4 link)|20 Gbit/s|2 GB/s [z]|2012| |Direct Media Interface 3.0 (DMI 3.0; ×4 link)|40 Gbit/s|4 GB/s [z]|2015| |AGP 8×|17.066 Gbit/s|2.133 GB/s|2002| |AGP 8× 64-bit|34.133 Gbit/s|4.266 GB/s|| |PCI 32-bit/66 MHz|2.133 Gbit/s|266.7 MB/s|1995| |PCI 64-bit/100 MHz|6.4 Gbit/s|800 MB/s|| |PCI-X QDR|34.133 Gbit/s|4.266 GB/s|| |PCI Express 2.0 (×32 link)[43]|160 Gbit/s|16 GB/s [z]|2007| |PCI Express 3.0 (×32 link)[44]|256 Gbit/s|31.51 GB/s [y]|2011| |QPI (9.6GT/s, 4.8 GHz)|307.2 Gbit/s|38.4 GB/s|2014|
https://en.wikipedia.org/wiki/NVLink
https://en.wikipedia.org/wiki/InfiniBand
Text | SDR | DDR | QDR | FDR10 | FDR | EDR | HDR | NDR | XDR |
|---|---|---|---|---|---|---|---|---|---|
Signaling rate (Gbit/s) | 2.5 | 5 | 10 | 10.3125 | 14.0625[6] | 25.78125 | 50 | 100 | 250 |
Theoretical effective throughput, Gbs, per 1x[7] | 2 | 4 | 8 | 10 | 13.64 | 25 | 50 | | |
Speeds for 12x links (Gbit/s) | 24 | 48 | 96 | 120 | 163.64 | 300 | 600 | | |
Encoding (bits) | 8/10 | 8/10 | 8/10 | 64/66 | 64/66 | 64/66 | 64/66 | | |
Adapter latency (microseconds)[8] | 5 | 2.5 | 1.3 | 0.7 | 0.7 | 0.5 | | | |
Year[9] | 2001,2003 | 2005 | 2007 | 2011 | 2011 | 2014[7] | 2017[7] | after 2020 | future |
/opt/vc/bin/vcgencmd measure_temp
/dev/ttyAMA0
Speed (baud rate): 115200
Bits: 8
Parity: None
Stop Bits: 1
Flow Control: None
SQCIF = 128x96
QCIF = 176x144
QVGA = 320x240
CIF = 352x240/288
HVGA = 640x240
VGA = 640x480
2 CIF = 704x240/288
4 CIF = 704x480/576
D1 CROPPED = 704x480/576
D1 = 720x480/576
D1 (525) 720 x 480 is in NTSC
D1 (625) 720 x 576 is in PAL
720p is 1280 x 720. (921,600 total pixels)
1080p is 1920x1080. (2,073,600 total pixels)
3MP is 2048 x 1536. (3,145,728 total pixels)
5MP is 2560 x 1920. (4,915,200 total pixels)
Last modified 25d ago