Re: [PATCH 0/3] serial: sh-sci: Clock handling improvements

On 12/19/21 4:53 AM, Geert Uytterhoeven wrote:

quoted

By the way, did you ever figure out how to get the first serial port to work on
qemu so qemu-system-sh4 doesn't have to "-serial null -serial mon:stdio" to get
a serial console?

Nope, same as last time you asked ;-)

Well it had been a couple years, you never know...

However, upon a fresh look at linux/arch/sh/boards/mach-r2d/setup.c,
I noticed something I missed before: the SCI port is not available
as a UART, as it is used to talk SPI to an RTC.

/* Single Epson RTC-9701JE attached on CS0 */

Huh. That does explain the CONFIG_RTC_DRV_R9701=y in rts7751r2d*_defconfig.
(And also SPI SPI_SH_SCI MFD_SM501 RTC_CLASS and RTC_DRV_SH RTC_HCTOSYS which
I've never gotten connected to QEMU.)

So that means qemu
has the hardware description wrong?

It would be nice if qemu-system-sh4 grew an RTC. Looks like Sato-san and Magnus
Damm are the qemu-system-sh4 maintainers? (cc'd)

Thanks,

Rob