“Small” CPUs such as those found in embedded SoCs have lacked this feature since their inception. I trace this convention back to the introduction of the ARM7TDMI core in the 1990s. Back then, transistors were scarce, memory even more so, and so virtual memory was not a great product/market fit for devices with just a couple kilobytes of RAM, not even enough to hold a page table. The ARM7TDMI core’s efficiency and low cost made it a run-away success, shipping over a billion units and establishing ARM as the dominant player in the embedded SoC space.
“高原病，一直是高原工作生活中遇到的最大困难。”对青藏地区的医疗状况，习近平总书记挂念在心：“现在条件、技术水平很多都跟上了，但是这方面还要加强。健康中国建设，边远地区的这块短板要补上。多措并举，中医药和藏药、蒙药、苗药等民族医药，也是我们的宝贵财富。”
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David SillitoArts correspondent, in Spernall in Warwickshire，详情可参考谷歌
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