Hi Thomas! On 11/27/20 8:44 AM, Thomas Zimmermann wrote:
I am doing regular kernel bisects for SuperH and other embedded architectures,
Somewhat offtopic: is there an effortable development board for SuperH? Specifically, I'm looking for hardware that allows me to test the DRM SH mobile driver.
There are two cheap alternatives: One is the LANDISK USL-5P which has a SH-7751R CPU clocked at 266 MHz, 64 MiB RAM and a CF card. The board boots a vanilla upstream kernel which is also actively maintained, also since I send Geert Uytterhoven a free board. And, secondly, there is the NextVoD, a Video-on-Demand multimedia box from Taiwan which has an ST-40 SH4 SoC clocked at 450 MHz with 256 MiB RAM and even u-boot. Support for the NextVoD is currently out-of-tree only [1] as Paul Mundt removed ST-40 support from arch/sh at some point. But we're planning to reintroduce ST-40 support in the near future which should also become easier once device tree support has been merged for arch/sh [2]. I have plenty of USL-5P and NextVoD devices at home which I brought from Japan and Taiwan, respectively and I'm happy to send either of them to any kernel developer willing to work on the SH port. I also have some development boards from Renesas which I got through personal contacts in Japan directly from Renesas but these are extremely rare which is why I will only provide remote access to these boxes but not give them away. So, if you are interested in doing some SuperH development, let me know. In particular, getting a current kernel to boot on the NextVoD would be awesome. Adrian
[1] https://github.com/system1357/pdk7105-3.4 [2] https://patchwork.kernel.org/project/linux-sh/patch/20160212041424.GA11747@b...