New Linux Patches Trying To Mainline Renesas SH7305 CPU Support
A developer has sent the first small architecture patches toward mainline Linux support for the Renesas SH7305, a 32-bit SH-4a CPU used in Casio graphing calculators.
This is only the start of an enablement effort: the initial changes adjust compiler flags and add CPU/Kconfig plumbing. Clock, interrupt-controller, timer, and board support are still expected in follow-up work. The chip has no FPU, runs at about 118 MHz, and is typically paired with roughly 8 MB of RAM, so the article notes that practical scope is limited.
The Phoronix thread returned HTTP 403, and Anubis blocked the linked LKML patch page; I couldn’t verify source reactions or inspect the patch details directly.