Merge https://gitlab.denx.de/u-boot/custodians/u-boot-riscv

- Fix wrong amoswap t1 usage in startup.
- Reset the board after crash.
- Enable distro booting from an attached SCSI disk for QEMU.
- Support the optional header fields in efi header.

arch/riscv/cpu/start.S

@@ -123,7 +123,7 @@ call_board_init_f_0:
 	 * wait for initialization to complete.
 	 */
 	la	t0, hart_lottery
-	li	s2, 1
+	li	t1, 1
 	amoswap.w s2, t1, 0(t0)
 	bnez	s2, wait_for_gd_init
 #else

arch/riscv/lib/crt0_riscv_efi.S

@@ -15,11 +15,13 @@
 #define SAVE_LONG(reg, idx)	sd	reg, (idx*SIZE_LONG)(sp)
 #define LOAD_LONG(reg, idx)	ld	reg, (idx*SIZE_LONG)(sp)
 #define PE_MACHINE	IMAGE_FILE_MACHINE_RISCV64
+#define PE_MAGIC    IMAGE_NT_OPTIONAL_HDR64_MAGIC
 #else
 #define SIZE_LONG	4
 #define SAVE_LONG(reg, idx)	sw	reg, (idx*SIZE_LONG)(sp)
 #define LOAD_LONG(reg, idx)	lw	reg, (idx*SIZE_LONG)(sp)
 #define PE_MACHINE	IMAGE_FILE_MACHINE_RISCV32
+#define PE_MAGIC    IMAGE_NT_OPTIONAL_HDR32_MAGIC
 #endif
 
 
@@ -48,7 +50,7 @@ coff_header:
 		 IMAGE_FILE_LOCAL_SYMS_STRIPPED | \
 		 IMAGE_FILE_DEBUG_STRIPPED)
 optional_header:
-	.short	IMAGE_NT_OPTIONAL_HDR64_MAGIC	/* PE32+ format */
+	.short	PE_MAGIC			/* PE32(+) format */
 	.byte	0x02				/* MajorLinkerVersion */
 	.byte	0x14				/* MinorLinkerVersion */
 	.long	_edata - _start			/* SizeOfCode */
@@ -56,9 +58,16 @@ optional_header:
 	.long	0				/* SizeOfUninitializedData */
 	.long	_start - ImageBase		/* AddressOfEntryPoint */
 	.long	_start - ImageBase		/* BaseOfCode */
+#if __riscv_xlen == 32
+	.long	0				/* BaseOfData */
+#endif
 
 extra_header_fields:
+#if __riscv_xlen == 32
+	.long	0				/* ImageBase */
+#else
 	.quad	0				/* ImageBase */
+#endif
 	.long	0x20				/* SectionAlignment */
 	.long	0x8				/* FileAlignment */
 	.short	0				/* MajorOperatingSystemVersion */
@@ -78,10 +87,17 @@ extra_header_fields:
 	.long	0				/* CheckSum */
 	.short	IMAGE_SUBSYSTEM_EFI_APPLICATION /* Subsystem */
 	.short	0				/* DllCharacteristics */
+#if __riscv_xlen == 32
+	.long	0				/* SizeOfStackReserve */
+	.long	0				/* SizeOfStackCommit */
+	.long	0				/* SizeOfHeapReserve */
+	.long	0				/* SizeOfHeapCommit */
+#else
 	.quad	0				/* SizeOfStackReserve */
 	.quad	0				/* SizeOfStackCommit */
 	.quad	0				/* SizeOfHeapReserve */
 	.quad	0				/* SizeOfHeapCommit */
+#endif
 	.long	0				/* LoaderFlags */
 	.long	0x6				/* NumberOfRvaAndSizes */
 
@@ -91,6 +107,16 @@ extra_header_fields:
 	.quad	0				/* ExceptionTable */
 	.quad	0				/* CertificationTable */
 	.quad	0				/* BaseRelocationTable */
+	.quad	0				/* Debug */
+	.quad	0				/* Architecture */
+	.quad	0				/* Global Ptr */
+	.quad	0				/* TLS Table */
+	.quad	0				/* Load Config Table */
+	.quad	0				/* Bound Import */
+	.quad	0				/* IAT */
+	.quad	0				/* Delay Import Descriptor */
+	.quad	0				/* CLR Runtime Header */
+	.quad	0				/* Reserved */
 
 	/* Section table */
 section_table:

arch/riscv/lib/interrupts.c

@@ -27,7 +27,7 @@ static void show_efi_loaded_images(uintptr_t epc)
 static void show_regs(struct pt_regs *regs)
 {
 #ifdef CONFIG_SHOW_REGS
-	printf("SP:  " REG_FMT " GP:  " REG_FMT " TP:  " REG_FMT "\n",
+	printf("\nSP:  " REG_FMT " GP:  " REG_FMT " TP:  " REG_FMT "\n",
 	       regs->sp, regs->gp, regs->tp);
 	printf("T0:  " REG_FMT " T1:  " REG_FMT " T2:  " REG_FMT "\n",
 	       regs->t0, regs->t1, regs->t2);
@@ -45,7 +45,7 @@ static void show_regs(struct pt_regs *regs)
 	       regs->s7, regs->s8, regs->s9);
 	printf("S10: " REG_FMT " S11: " REG_FMT " T3:  " REG_FMT "\n",
 	       regs->s10, regs->s11, regs->t3);
-	printf("T4:  " REG_FMT " T5:  " REG_FMT " T6:  " REG_FMT "\n\n",
+	printf("T4:  " REG_FMT " T5:  " REG_FMT " T6:  " REG_FMT "\n",
 	       regs->t4, regs->t5, regs->t6);
 #endif
 }
@@ -80,12 +80,12 @@ static void _exit_trap(ulong code, ulong epc, ulong tval, struct pt_regs *regs)
 	       epc, regs->ra, tval);
 	/* Print relocation adjustments, but only if gd is initialized */
 	if (gd && gd->flags & GD_FLG_RELOC)
-		printf("EPC: " REG_FMT " RA: " REG_FMT " reloc adjusted\n\n",
+		printf("EPC: " REG_FMT " RA: " REG_FMT " reloc adjusted\n",
 		       epc - gd->reloc_off, regs->ra - gd->reloc_off);
 
 	show_regs(regs);
 	show_efi_loaded_images(epc);
-	hang();
+	panic("\n");
 }
 
 int interrupt_init(void)

include/configs/qemu-riscv.h

@@ -35,6 +35,7 @@
 #define BOOT_TARGET_DEVICES(func) \
 	func(QEMU, qemu, na) \
 	func(VIRTIO, virtio, 0) \
+	func(SCSI, scsi, 0) \
 	func(DHCP, dhcp, na)
 
 #include <config_distro_bootcmd.h>