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外媒爆集成GPU的龙芯2H即将流片 (转)

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发表于 2011-5-1 11:22:32 | 显示全部楼层 |阅读模式
http://semiaccurate.com/2011/04/ ... ready-for-tape-out/


此文要点:龙芯2H定在数周内流片。
 楼主| 发表于 2011-5-1 11:51:11 | 显示全部楼层
自己沙发,我认为因为有2G的基础这次流片成功率应该很大。希望可以一次成功。:-)
发表于 2011-5-1 12:07:44 | 显示全部楼层
本帖最后由 hdst 于 2011-5-1 12:09 编辑

Yes, you are absolutely right. We are talking about Longson 2H – formerly known as Godson 2H. There is no difference between Godson and Longson – it’s just that Godson is the academic name, whereas Longson is the commercial name.

Longson is a commercial spin-off from ICT – an institute under The Chinese Academy of Sciences. This chip should be seen as a direct competitor to chips from both ARM and Intel.

Longson 2H is a SoC that includes CPU core, graphics core, memory controller as well as the traditional south bridge functionality all in one chip. And it is set to tape out in a few weeks. The CPU core in Longson 2H is the same as in 2G, which means that we are talking about a 4-way superscalar core with out-of-order execution based on the MIPS64 instruction set. It runs a variety of operating systems, but will mainly be using Red Flag Linux, a Chinese distribution.

The core consumes 4W at 1 GHz and includes 64/64KB L1 cache and 512KB level 2 cache.  In addition there is a graphics core based on technology that has been licensed from Vivante. This is a mobile architecture that has been designed withpower saving in mind, but nonetheless is capable of 1080p playback.

According to Weiwu Hu, the president of Longson, they chose the Vivante GPU because it takes up less space than other designs while delivering the same performance.  Once again, letting efficiency win out.

The shader architecture is a unified vertex and fragment/pixel shader, which means no wasted GPU cycles Full OpenGL ES 2.0 Shading Language support for unrestricted programmability. On top of that there is IEEE 32-bit high-precision computing. The GPU is designed to be massively parallel multi-threading virtually eliminates graphics bottlenecks.

On the texture side there is support, which includes 2D, Cubic environment, Projective, YUY2, and High Dynamic Range (HDR) Point sample, bi-linear, and tri-linear texture filters. Depth map is up to 24-bit compressed texture standards ETC1 and DXT1-DXT5 dependent texture operation with high performance. There is support for up to 16 vertex textures and 16 pixel textures simultaneously Supports texture size up to 8K x 8K.S|A

网站太慢了,我把它转过来
发表于 2011-5-1 12:17:44 | 显示全部楼层
文中说二级缓存512k,我记得是1g的。
发表于 2011-5-1 12:27:47 | 显示全部楼层
本帖最后由 hdst 于 2011-5-1 12:50 编辑

回复 4# yth

我觉得这篇文章老外主观臆测的成分较大。

你看下面的评论,512KB有人都觉得太大了。我觉得作者只想使文章有平地一声雷的效果,众多的观众可能以前听也没听说过龙芯。
发表于 2011-5-1 12:55:26 | 显示全部楼层
看这条评论:
Now if MIPS (the company) could only show some love to the compiler/toolchain folks. The MIPS GCC backend is seriously lacking, horribly buggy, could use a dedicated maintainer looking after it, and a decent new ABI should be established.
Intel and ARM realized that the software sells the hardware, not the other way around. Someone should preach this to MIPS. A well-maintained compiler infrastructure is a must if you want your architecture to survive.
发表于 2011-5-2 09:14:35 | 显示全部楼层
2G 的 L2 cache 不是1M 吗? 怎么文中说白2H的L2 cache 是512K 呀
干嘛缩水呢,还是报道有出入呀
发表于 2011-5-3 11:04:00 | 显示全部楼层
原来打得是一场狙击战。据说ARM要收购AMD,AMD坚持不下去了,Intel要大力发展Atom。x86要走向移动设备,原来面向移动设备的ARM要走向通用平台。龙芯(至少部分产品)是否在磨刀霍霍,等待这个交叉点的到来。是否成功就看能否让Windows支持MIPS了。
发表于 2011-5-3 12:26:16 | 显示全部楼层
Windows支持MIPS我看不行,市面上的软件差不多都是x86汇编,除非MIPS支持x86
发表于 2011-5-4 17:06:24 | 显示全部楼层
绝大部分软件应该重新编译一下就可以了。一个好的硬件平台出来之后,只要有明确的说服力(在应用上为什么比别人好,而且好在实处,也就是用户真地需要的好处),软件很快也就会跟上来。iphone不就是这样吗?

如果软件厂商能够赚钱的话,我认为他们不会不出一套for MIPS产品的,比如Microsofe Office for MAC。当然,要顾及盗版软件用户的话,那么硬件支持x86就非常需要了。

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