Merge from bittboy/buildroot@db180c0

board/qemu/sh4-r2d/linux.config

@@ -0,0 +1,38 @@
+CONFIG_SYSVIPC=y
+CONFIG_MODULES=y
+CONFIG_CPU_SUBTYPE_SH7751R=y
+CONFIG_MEMORY_START=0x0c000000
+CONFIG_FLATMEM_MANUAL=y
+CONFIG_SH_RTS7751R2D=y
+CONFIG_RTS7751R2D_PLUS=y
+CONFIG_HEARTBEAT=y
+CONFIG_PCI=y
+CONFIG_NET=y
+CONFIG_PACKET=y
+CONFIG_UNIX=y
+CONFIG_INET=y
+CONFIG_BLK_DEV_SD=y
+CONFIG_ATA=y
+CONFIG_PATA_PLATFORM=y
+CONFIG_NETDEVICES=y
+CONFIG_8139CP=y
+CONFIG_SERIAL_8250=y
+CONFIG_SERIAL_SH_SCI=y
+CONFIG_SERIAL_SH_SCI_CONSOLE=y
+CONFIG_SPI=y
+CONFIG_SPI_SH_SCI=y
+CONFIG_MFD_SM501=y
+CONFIG_FB=y
+CONFIG_FB_SH_MOBILE_LCDC=y
+CONFIG_FB_SH_MOBILE_HDMI=y
+CONFIG_FB_SM501=y
+CONFIG_FRAMEBUFFER_CONSOLE=y
+CONFIG_LOGO=y
+CONFIG_SOUND=y
+CONFIG_SND_YMFPCI=y
+CONFIG_SOUND_PRIME=y
+CONFIG_RTC_CLASS=y
+CONFIG_RTC_DRV_R9701=y
+CONFIG_EXT4_FS=y
+CONFIG_TMPFS=y
+CONFIG_TMPFS_POSIX_ACL=y

board/qemu/sh4-r2d/patches/linux/0001-Revert-serial-sh-sci-increase-RX-FIFO-trigger-defaul.patch

@@ -0,0 +1,61 @@
+From aaaced6d2d6f796ed77e4725ed7ccbedb189c180 Mon Sep 17 00:00:00 2001
+From: Romain Naour <romain.naour@gmail.com>
+Date: Fri, 15 Jun 2018 17:43:38 +0200
+Subject: [PATCH] Revert: serial: sh-sci: increase RX FIFO trigger defaults for
+ (H)SCIF
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+This reverts commit 18e8cf159177100e69d528293f8cf6875c0b1bca (kernel)
+
+The last Qemu kernel update [1] introduced a regresion in sh4 SCIF
+serial device. Some keyboard presses are very slow to be taken into
+account, perhaps not even taken into account at all. This would
+explain why our test infrastructure doesn’t manage to login as root
+[2][3][4].
+
+git bisect reported a kernel patch from 4.11, increasing RX FIFO
+trigger defaults value for sh-sci (H)SCIF. The kernel patch itself
+looks good but the Qemu emulation is not ready to handle this new
+setting.
+
+From Qemu (2.12.0): target/sh4/README.sh4
+"Configuration of the second serial port (SCIF) is supported. FIFO
+handling infrastructure has been started but is not completed yet."
+
+In order to be able to test sh4 architecture with newer kernel,
+revert to the old behaviour.
+
+[1] https://git.buildroot.net/buildroot/commit/?id=03fb00f2175cdb4565e26fcb9b3da1c1059de1bd
+[2] https://gitlab.com/free-electrons/toolchains-builder/-/jobs/72006425
+[3] https://gitlab.com/free-electrons/toolchains-builder/-/jobs/72006427
+[4] https://gitlab.com/free-electrons/toolchains-builder/-/jobs/72006426
+
+Signed-off-by: Romain Naour <romain.naour@gmail.com>
+Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
+---
+ drivers/tty/serial/sh-sci.c | 7 ++-----
+ 1 file changed, 2 insertions(+), 5 deletions(-)
+
+diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
+index ab757546c6db..138e4dec44fb 100644
+--- a/drivers/tty/serial/sh-sci.c
++++ b/drivers/tty/serial/sh-sci.c
+@@ -2793,11 +2793,8 @@ static int sci_init_single(struct platform_device *dev,
+ 		sci_port->rx_trigger = 32;
+ 		break;
+ 	case PORT_SCIF:
+-		if (p->regtype == SCIx_SH7705_SCIF_REGTYPE)
+-			/* RX triggering not implemented for this IP */
+-			sci_port->rx_trigger = 1;
+-		else
+-			sci_port->rx_trigger = 8;
++		/* RX triggering not implemented in Qemu emulation */
++		sci_port->rx_trigger = 1;
+ 		break;
+ 	default:
+ 		sci_port->rx_trigger = 1;
+-- 
+2.14.4
+

board/qemu/sh4-r2d/readme.txt

@@ -0,0 +1,8 @@
+Run the emulation with:
+
+  qemu-system-sh4 -M r2d -kernel output/images/zImage -drive file=output/images/rootfs.ext2,if=ide,format=raw -append "rootwait root=/dev/sda console=ttySC1,115200 noiotrap" -serial null -serial stdio -net nic,model=rtl8139 -net user
+
+The login prompt will appear in the terminal that started Qemu.
+The graphical window is the framebuffer.
+
+Tested with QEMU 2.12.0