319e89cdc3
The ESCC datasheet states that SPEC_ALLSENT is always set in sync mode and set in async mode once all characters have cleared the transmitter. Since writes to SERIAL_DATA use a synchronous chardev API, the guest can never see the state when transmission is in progress so it is possible to set SPEC_ALLSENT in the R_SPEC register unconditionally. This fixes a hang when using the Sun PROM as it attempts to enumerate the onboard serial devices, and a similar hang in OpenBSD SPARC32 where in both cases the boot process will not proceed until SPEC_ALLSENT has been set after writing to W_TXCTRL1. Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Message-Id: <20211118181835.18497-3-mark.cave-ayland@ilande.co.uk> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> |
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|---|---|---|
| .. | ||
| avr_usart.c | ||
| bcm2835_aux.c | ||
| cadence_uart.c | ||
| cmsdk-apb-uart.c | ||
| debugcon.c | ||
| digic-uart.c | ||
| escc.c | ||
| etraxfs_ser.c | ||
| exynos4210_uart.c | ||
| goldfish_tty.c | ||
| grlib_apbuart.c | ||
| ibex_uart.c | ||
| imx_serial.c | ||
| ipoctal232.c | ||
| Kconfig | ||
| mcf_uart.c | ||
| mchp_pfsoc_mmuart.c | ||
| meson.build | ||
| nrf51_uart.c | ||
| omap_uart.c | ||
| parallel-isa.c | ||
| parallel.c | ||
| pl011.c | ||
| renesas_sci.c | ||
| riscv_htif.c | ||
| sclpconsole-lm.c | ||
| sclpconsole.c | ||
| serial-isa.c | ||
| serial-pci-multi.c | ||
| serial-pci.c | ||
| serial.c | ||
| sh_serial.c | ||
| shakti_uart.c | ||
| sifive_uart.c | ||
| spapr_vty.c | ||
| stm32f2xx_usart.c | ||
| terminal3270.c | ||
| trace-events | ||
| trace.h | ||
| virtio-console.c | ||
| virtio-serial-bus.c | ||
| xen_console.c | ||
| xilinx_uartlite.c | ||