Re: [U-Boot] [v4 PATCH] RISCV: image: Add booti support

[Heinrich Schuchardt]

On 5/6/19 8:11 PM, Atish Patra wrote:
> This patch adds booti support for RISC-V Linux kernel. The existing
> bootm method will also continue to work as it is.
>
> It depends on the following kernel patch which adds the header to the
> flat Image. Gzip compressed Image (Image.gz) support is not enabled with
> this patch.
>
> https://patchwork.kernel.org/patch/10925543/
>
> Tested on HiFive Unleashed and QEMU.
>
> Signed-off-by: Atish Patra <atish.patra@xxxxxxx>
> Reviewed-by: Tom Rini <trini@xxxxxxxxxxxx>
> Tested-by: Karsten Merker <merker@xxxxxxxxxx>
> ---
> Changes from v3->v4
> 1. Rebased on top of master to avoid git am errors.
>
> Changes from v2->v3
> 1. Updated the image header structure as per kernel patch.
> 2. Removed Image.gz support as it will be added as separate RFC patch.
> ---
>   arch/riscv/lib/Makefile |  1 +
>   arch/riscv/lib/image.c  | 55 +++++++++++++++++++++++++++++++++++++++++
>   cmd/Kconfig             |  2 +-
>   cmd/booti.c             |  8 ++++--
>   4 files changed, 63 insertions(+), 3 deletions(-)
>   create mode 100644 arch/riscv/lib/image.c
>
> diff --git a/arch/riscv/lib/Makefile b/arch/riscv/lib/Makefile
> index 1c332db436a9..6ae6ebbeafda 100644
> --- a/arch/riscv/lib/Makefile
> +++ b/arch/riscv/lib/Makefile
> @@ -7,6 +7,7 @@
>   # Rick Chen, Andes Technology Corporation <rick@xxxxxxxxxxxxx>
>
>   obj-$(CONFIG_CMD_BOOTM) += bootm.o
> +obj-$(CONFIG_CMD_BOOTI) += bootm.o image.o
>   obj-$(CONFIG_CMD_GO) += boot.o
>   obj-y	+= cache.o
>   obj-$(CONFIG_RISCV_RDTIME) += rdtime.o
> diff --git a/arch/riscv/lib/image.c b/arch/riscv/lib/image.c
> new file mode 100644
> index 000000000000..d063beb7dfbe
> --- /dev/null
> +++ b/arch/riscv/lib/image.c
> @@ -0,0 +1,55 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2019 Western Digital Corporation or its affiliates.
> + * Authors:
> + *	Atish Patra <atish.patra@xxxxxxx>
> + * Based on arm/lib/image.c
> + */
> +
> +#include <common.h>
> +#include <mapmem.h>
> +#include <errno.h>
> +#include <linux/sizes.h>
> +#include <linux/stddef.h>
> +
> +DECLARE_GLOBAL_DATA_PTR;
> +
> +/* ASCII version of "RISCV" defined in Linux kernel */
> +#define LINUX_RISCV_IMAGE_MAGIC 0x5643534952
> +
> +struct linux_image_h {
> +	uint32_t	code0;		/* Executable code */
> +	uint32_t	code1;		/* Executable code */
> +	uint64_t	text_offset;	/* Image load offset */
> +	uint64_t	image_size;	/* Effective Image size */
> +	uint64_t	res1;		/* reserved */
> +	uint64_t	res2;		/* reserved */
> +	uint64_t	res3;		/* reserved */
> +	uint64_t	magic;		/* Magic number */
> +	uint32_t	res4;		/* reserved */
> +	uint32_t	res5;		/* reserved */
> +};
> +
> +int booti_setup(ulong image, ulong *relocated_addr, ulong *size,
> +		bool force_reloc)
> +{
> +	struct linux_image_h *lhdr;
> +
> +	lhdr = (struct linux_image_h *)map_sysmem(image, 0);
> +
> +	if (lhdr->magic != LINUX_RISCV_IMAGE_MAGIC) {
> +		puts("Bad Linux RISCV Image magic!\n");
> +		return -EINVAL;
> +	}
> +
> +	if (lhdr->image_size == 0) {
> +		puts("Image lacks image_size field, error!\n");
> +		return -EINVAL;
> +	}
> +	*size = lhdr->image_size;
> +	*relocated_addr = gd->ram_base + lhdr->text_offset;
> +
> +	unmap_sysmem(lhdr);
> +
> +	return 0;
> +}
> diff --git a/cmd/Kconfig b/cmd/Kconfig
> index 069e0ea7300b..4e11e0f404c8 100644
> --- a/cmd/Kconfig
> +++ b/cmd/Kconfig
> @@ -223,7 +223,7 @@ config CMD_BOOTZ
>
>   config CMD_BOOTI
>   	bool "booti"
> -	depends on ARM64
> +	depends on ARM64 || RISCV
>   	default y
>   	help
>   	  Boot an AArch64 Linux Kernel image from memory.
> diff --git a/cmd/booti.c b/cmd/booti.c
> index 04353b68eccc..5e902993865b 100644
> --- a/cmd/booti.c
> +++ b/cmd/booti.c
> @@ -77,7 +77,11 @@ int do_booti(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
>   	bootm_disable_interrupts();
>
>   	images.os.os = IH_OS_LINUX;
> +#ifdef CONFIG_RISCV_SMODE
> +	images.os.arch = IH_ARCH_RISCV;
> +#elif CONFIG_ARM64
>   	images.os.arch = IH_ARCH_ARM64;
> +#endif
>   	ret = do_bootm_states(cmdtp, flag, argc, argv,
>   #ifdef CONFIG_SYS_BOOT_RAMDISK_HIGH
>   			      BOOTM_STATE_RAMDISK |
> @@ -92,7 +96,7 @@ int do_booti(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
>   #ifdef CONFIG_SYS_LONGHELP
>   static char booti_help_text[] =
>   	"[addr [initrd[:size]] [fdt]]\n"
> -	"    - boot arm64 Linux Image stored in memory\n"
> +	"    - boot arm64/riscv Linux Image stored in memory\n"

Why would you repeat the short description? Just remove this line.


>   	"\tThe argument 'initrd' is optional and specifies the address\n"
>   	"\tof an initrd in memory. The optional parameter ':size' allows\n"
>   	"\tspecifying the size of a RAW initrd.\n"
> @@ -107,5 +111,5 @@ static char booti_help_text[] =
>
>   U_BOOT_CMD(
>   	booti,	CONFIG_SYS_MAXARGS,	1,	do_booti,
> -	"boot arm64 Linux Image image from memory", booti_help_text
> +	"boot arm64/riscv Linux Image image from memory", booti_help_text

%s/Image image/image/

"arm64/riscv" is distracting. If I am on RISC-V I cannot boot an ARM64
image here. Remove the reference to the architecture, please.

Best regards

Heinrich

>   );