桥片的显示单元从多方信息看，有几个关键词，统一渲染架构， 4倍抗锯齿， OpenGL2.1 ，视频输出接口统一成 HDMI 1.4b ，gpu能力等效AMD HD3200，基本上可以替换亮机卡，桌面能达到 1080P FULL 流畅不卡顿。另外值得一提的是，虽说是桥片内置显卡，整体上还是独显架构，GPU运算集中在单独的DDR4显存里，通过DMA和内存交换数据。如果显示单元满负荷，再加上4倍抗锯齿，7A2000的散热需要强化，出来的板子就要留意一下桥片散热了，当然也要留意主板上显存的大小，128MB太小了！，目前看到的7A2000主板，显存都是1GB！新增：着色器64个，工作频率500MHZ 显存：DDR4 2400MHZ 从手册信息看，单路的u+7A2000，若只是普通桌面应用，能省一块亮机卡，主板上也能省下usb3.0和网卡芯片，性能整体还有+1效果，整机确实能降低成本，接口再做的丰富些，会是不错的选择！ [ 3.083666] [drm] initializing kernel modesetting (LG100 0x0014:0x7A25 0x0000:0x0000 0x01). [ 3.083669] [drm] Set 7A2000 device in gsgpu driver [ 3.083672] [drm] register mmio base: 0x3126E400 [ 3.083673] [drm] register mmio size: 256 [ 3.083676] [drm] gsgpu dc register mmio base: 0x31210000 [ 3.083677] [drm] gsgpu dc register mmio size: 65536 [ 3.083681] [drm] gsgpu dc io base: 0xffff800125f44000 [ 3.597630] [drm] GPU Family: LG100 series LG110, Feature:0x00000000 [ 3.597633] [drm] Firmware Version: 1.0.0 [ 3.597644] [drm] aper_base 0xe0020000000 SIZE 0x10000000 bytes [ 3.597650] gsgpu 0000:00:06.0: VRAM: 256M 0x0001000000000000 - 0x000100000FFFFFFF (256M used) [ 3.597651] gsgpu 0000:00:06.0: GART: 256M 0x0000000000000000 - 0x000000000FFFFFFF [ 3.597653] [drm] Detected VRAM RAM=256M, BAR=256M [ 3.597654] [drm] RAM width 32bits UNKNOWN [ 3.597709] [TTM] Zone kernel: Available graphics memory: 8268416 kiB [ 3.597710] [TTM] Zone dma32: Available graphics memory: 2097152 kiB [ 3.597711] [TTM] Initializing pool allocator [ 3.597717] [TTM] Initializing DMA pool allocator [ 3.598211] [drm] gsgpu: 256M of VRAM memory ready [ 3.598214] [drm] gsgpu: 3072M of GTT memory ready. [ 3.598240] [drm] GART: num cpu pages 16384, num gpu pages 16384 [ 3.598292] [drm] vm size is 1024 GB, 3 levels, block size is 11-bit [ 3.705629] [drm] PCIE GART of 256M enabled (table at 0x0001000000000000). [ 3.717636] [drm] ZIP META: num cpu pages 128, num gpu pages 128 [ 3.724460] [drm] GSGPU get vbios from vram Success [ 3.724474] [drm] GSGPU vbios header info: [ 3.724476] [drm] ver:2.1 links2 max_planes-1879048188 name Loongson-VBIOS [ 3.724477] [drm] oem-vendor UU oem-product 2022 [ 3.724478] [drm] GSGPU vbios crtc0 max frep340000 width4096 height4096 [ 3.724479] [drm] GSGPU vbios crtc1 max frep340000 width4096 height4096 [ 3.724481] [drm] GSGPU vram type:DDR4, bit width:32#bit [ 3.724482] [drm] capacity:1000#MB, vram freq:2400MHZ [ 3.724483] [drm] gpu shaders num:64, shader freq:500#MHZ, freq count:3 [ 3.724488] [drm] No ext encoder chip 0x1. [ 3.724491] [drm] Encoder Parse: #0x01-Unknown type:dac hotplug:irq. [ 3.724492] [drm] Encoder Parse: config_type:kernel, edid_method:i2c. [ 3.724494] [drm] No ext encoder chip 0x2. [ 3.724496] [drm] Encoder Parse: #0x02-Unknown type:tmds hotplug:irq. [ 3.724496] [drm] Encoder Parse: config_type:kernel, edid_method:i2c. [ 3.724497] [drm] GSGPU Display Core initialized with v1.0! [ 3.724498] [drm] GSGPU DC construct links:2 [ 3.809628] [drm] PCIE ZIP META of 2M enabled (table at 0x0001000000200000). [ 3.809637] [drm] GSGPU DC irq init sources number:9 [ 3.809890] [drm] GSGPU DC init gpio 0 addr 0x50 finish [ 3.809967] [drm] GSGPU DC init gpio 1 addr 0x50 finish [ 3.810002] [drm] GSGPU Display Crtcs [ 3.810003] [drm] Crtc 0: name:crtc-0 [ 3.810004] [drm] Crtc 1: name:crtc-1 [ 3.810005] [drm] GSGPU Display Connectors [ 3.810006] [drm] Connector 0: name:VGA-1 [ 3.810007] [drm] Connector 1: name:HDMI-A-1 [ 3.810007] [drm] GSGPU Display Encoders [ 3.810008] [drm] Encoder 0: name:TMDS-36 [ 3.810009] [drm] Encoder 1: name:TMDS-38 [ 3.810011] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013). [ 3.810011] [drm] Driver supports precise vblank timestamp query. [ 3.814539] [drm] Config crtc number:2 meta addr 0x1000000400000 [ 4.826675] usb 5-3: new full-speed USB device number 2 using ohci-pci [ 4.855830] [drm] fb mappable at 0xE0020000000 [ 4.855831] [drm] vram apper at 0xE0020000000 [ 4.855832] [drm] size 8306688 [ 4.855833] [drm] fb depth is 24 [ 4.855834] [drm] pitch is 7680 [ 4.855835] [drm] screen_base 0xFFFF800128600000 [ 4.855836] [drm] screen_size 0x7EC000 [ 4.865483] Console: switching to colour frame buffer device 240x67 [ 4.917709] gsgpu 0000:00:06.0: fb0: gsgpudrmfb frame buffer device [ 4.945723] [drm] Initialized gsgpu 0.1.0 20200501 for 0000:00:06.0 on minor 0

API支持上比较麻烦吧。 128M确实太小，能有512M就最棒了。

其实他们应该放弃桌面版 OpenGL，专心做实现难度较为简单的 OpenGL ES 甚至 Vulkan；在当前这个时间点，做 Vulkan 是更好的选择，因为 Vulkan 较为底层，设备驱动比 OpenGL、GLES 都更容易写，并且正是因为它较为底层，很方便模拟 OpenGL，这部分已经有现成的 Zink 项目了。甚至从 Vulkan 模拟 DirectX 都是较容易实现的（参考 DXVK）。

7A2000的数据手册和用户手册，提都没提有图形引擎渲染器。只是有显示控制器和显存的寄存器说明。关于图形引擎渲染器的信息，阉割的干干净净。估计，相关驱动，一时半会也没有推送到上游。一切才刚刚冒芽，路漫漫其修远啊。

龙芯新桥片7A2000的一些特性和主板图片视频资源

杜比

龙芯的 LS3A5000+7A2000 单路 EVB PC 主板

龙芯7A2000主板他来了
 龙芯7A2000对系统整体性提升有多少帮助-跑个分
 给7A2000的GPU跑了个分-惨忍
 龙芯电脑日常使用需要多少内存-装32G试试
 【龙芯笔记】龙芯3A5000+7A2000组合上机体验

杜比

淡炒番茄实物，显存1GB了

杜比

增加了一个风车的视频

淡炒番茄

显存是兆易创新的DDR4/4Gb颗粒，两片组成的1GB显存。

杜比

龙芯的 LS3A5000+7A2000 单路 EVB PC 主板 1.5版接口布局

loongarch群 ”战神狄青“ 提供图片，VGA口和HDMI口布局

凌莞

没有串口了，不好

maxmin

请问有能支持带鱼屏（21：9）的bios吗？（我的带鱼屏上只能16：9 1080p变形输出，能720p 21：9输出就行）

杜比

更新一些细节

[ 3.598292] [drm] vm size is 1024 GB, 3 levels, block size is 11-bit

[ 3.724482] [drm] capacity:1000#MB, vram freq:2400MHZ

[ 3.724483] [drm] gpu shaders num:64, shader freq:500#MHZ, freq count:3

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