modules/linux: Support building with Linux 6.1.8.

This is particularly beneficial for servers with Aspeed BMC video,
because it introduces framebuffer console acceleration.  The
framebuffer console is much more responsive.

Patches were ported from 5.10.5:

0001-fake-acpi.patch: This may not be needed any more, but it applies
cleanly and I don't think it would harm anything.

0002-nmi-squelch.patch: The comment mentions qemu but I see this
message on physical machines occasionally, so I think this is needed.

0003-fake-trampoline.patch: This patch does not apply cleanly.  It
could be ported, but I don't think it's needed, I dropped it.  Dates
back to a very old commit where Linux was being embedded into a vendor
UEFI firmware: a4d7654b1e.

0010-winterfell-ahci.patch: Minor change of %x to %lx in context.

Signed-off-by: Jonathon Hall <jonathon.hall@puri.sm>

modules/linux

@@ -31,6 +31,9 @@ linux_hash := a6fbd4ee903c128367892c2393ee0d9657b6ed3ea90016d4dc6f1f6da20b2330
 else ifeq "$(CONFIG_LINUX_VERSION)" "5.10.5"
 linux_version := 5.10.5
 linux_hash := 3991a9e16a187d78d5f414d89236ae5d7f404a69e60c4c42a9d262ee19612ef4
+else ifeq "$(CONFIG_LINUX_VERSION)" "6.1.8"
+linux_version := 6.1.8
+linux_hash := b60bb53ab8ba370a270454b11e93d41af29126fc72bd6ede517673e2e57b816d
 else
 $(error "$(BOARD): does not specify linux kernel version under CONFIG_LINUX_VERSION")
 endif 

patches/linux-6.1.8/0001-fake-acpi.patch

@@ -0,0 +1,32 @@
+diff --recursive -u ./clean/linux-4.9.80/drivers/acpi/acpica/evxfevnt.c linux-4.9.80/drivers/acpi/acpica/evxfevnt.c
+--- ./clean/linux-4.9.80/drivers/acpi/acpica/evxfevnt.c	2018-02-03 11:05:43.000000000 -0500
++++ linux-4.9.80/drivers/acpi/acpica/evxfevnt.c	2018-02-07 15:51:28.786502597 -0500
+@@ -111,6 +111,8 @@
+ 	}
+ 
+ 	ACPI_ERROR((AE_INFO, "Hardware did not enter ACPI mode"));
++printk("%s:%d faking ACPI mode\n", __func__, __LINE__);
++	return_ACPI_STATUS(AE_OK);
+ 	return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
+ }
+ 
+diff --recursive -u ./clean/linux-4.9.80/drivers/acpi/acpica/hwacpi.c linux-4.9.80/drivers/acpi/acpica/hwacpi.c
+--- ./clean/linux-4.9.80/drivers/acpi/acpica/hwacpi.c	2018-02-03 11:05:43.000000000 -0500
++++ linux-4.9.80/drivers/acpi/acpica/hwacpi.c	2018-02-07 15:51:35.126557868 -0500
+@@ -168,12 +168,16 @@
+ 
+ 	status = acpi_read_bit_register(ACPI_BITREG_SCI_ENABLE, &value);
+ 	if (ACPI_FAILURE(status)) {
++printk("%s:%d faking ACPI mode\n", __func__, __LINE__);
++		return_UINT32(ACPI_SYS_MODE_ACPI);
+ 		return_UINT32(ACPI_SYS_MODE_LEGACY);
+ 	}
+ 
+ 	if (value) {
+ 		return_UINT32(ACPI_SYS_MODE_ACPI);
+ 	} else {
++//printk("%s:%d faking ACPI mode\n", __func__, __LINE__);
++//		return_UINT32(ACPI_SYS_MODE_ACPI);
+ 		return_UINT32(ACPI_SYS_MODE_LEGACY);
+ 	}
+ }

patches/linux-6.1.8/0002-nmi-squelch.patch

@@ -0,0 +1,20 @@
+diff --recursive -u ./clean/linux-4.9.80/arch/x86/kernel/nmi.c linux-4.9.80/arch/x86/kernel/nmi.c
+--- ./clean/linux-4.9.80/arch/x86/kernel/nmi.c	2018-02-03 11:05:43.000000000 -0500
++++ linux-4.9.80/arch/x86/kernel/nmi.c	2018-02-07 18:56:10.475613884 -0500
+@@ -303,6 +303,8 @@
+ 
+ 	__this_cpu_add(nmi_stats.unknown, 1);
+ 
++#if 0
++// qemu generates these for some reason
+ 	pr_emerg("Uhhuh. NMI received for unknown reason %02x on CPU %d.\n",
+ 		 reason, smp_processor_id());
+ 
+@@ -311,6 +313,7 @@
+ 		nmi_panic(regs, "NMI: Not continuing");
+ 
+ 	pr_emerg("Dazed and confused, but trying to continue\n");
++#endif
+ }
+ NOKPROBE_SYMBOL(unknown_nmi_error);
+ 

patches/linux-6.1.8/0010-winterfell-ahci.patch

@@ -0,0 +1,18 @@
+diff --recursive -u ./clean/linux-4.9.80/drivers/ata/libahci.c linux-4.9.80/drivers/ata/libahci.c
+--- ./clean/linux-4.9.80/drivers/ata/libahci.c	2018-02-03 11:05:43.000000000 -0500
++++ linux-4.9.80/drivers/ata/libahci.c	2018-02-07 18:02:32.526535910 -0500
+@@ -537,8 +537,12 @@
+ 	}
+ 
+ 	/* fabricate port_map from cap.nr_ports for < AHCI 1.3 */
+-	if (!port_map && vers < 0x10300) {
+-		port_map = (1 << ahci_nr_ports(cap)) - 1;
++	if (!port_map) { //  && vers < 0x10300) {
++		printk("%s: saved_port=%02x\n", __func__, hpriv->saved_port_map);
++		writel(0x1, mmio + HOST_PORTS_IMPL);
++		port_map = readl(mmio + HOST_PORTS_IMPL);
++
++		//port_map = (1 << ahci_nr_ports(cap)) - 1;
+ 		dev_warn(dev, "forcing PORTS_IMPL to 0x%lx\n", port_map);
+ 
+ 		/* write the fixed up value to the PI register */