Loongson
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Loongson 2E
Loongson 2E was designed by ICT (Institute of Computing Technology), a department of The Chinese Academy of Sciences, helped and manufactured by STMicroelectronics.
ST Generic Part Number: STLS2E02
Features
Microarchitecture:
- 64 bit
- 9 pipeline stages
- 4-issue Out-Of-Order Executive
- 2 ALU, 2 FALU, 1 SIMD, 1 Load/Store Units
ISA: MIPSIII
Cache: 64KB L1 date, 64KB L1 instruction, on-chip 512KB L2.
Clock Frequency: 600MHz - 800MHz.
TDP: 4 Watt at 700MHz
Integrated: DDR-333 memory controller.
Highlights
- ST's Leading Edge 90nm process.
- Some new instructions: Allow write to register directly without MFLO or MFHI.
- Some new instructions: MADD.[S|D] MSUB.[S|D] NMADD.[S|D] NMSUB.[S|D].
- Some new SIMD instructions: similar to MMX, using FPU for parallel fixed-point arithmetic.
- An Execution bit: help OS to protect from buffer-flow attack.
Devices based on this CPU
Processor documentation
Chinese version
English version
Loongson 2F
Loongson 2F is the latest processor in Loongson 2 Family. Also manufactured by STMicroelectronics.
It is identical to the Loongson 2E with several improvements:
- Higher Clock Frequency: 1.2GHz maximum
- Advanced power control technology: less than 6 Watt under 1GHz in the same 90nm
- Integrated DDR2 controller
- Integrated northbridge providing faster IO (compared with former PCI bus) with PCI-X 66 bus
- Smaller Packaging.
Devices based on this CPU
Processor documentation
Chinese version
English version
Optimizing GNU/Linux distributions for loongson2f
Loongson2f software works considerably faster if compiled with the correct flags. Also some flags are required to work around processor bugs early in the production runs.
- Linux on Loongson Community
- Current loongson2f linux version / compiler / version flags wisdom?
- Taking full advantage of MIPSEL / loongson2f CPU
