[U-Boot] [RFC/RFT U-Boot PATCH] image: Add Image.gz parsing support in booti.
Atish Patra
Atish.Patra at wdc.com
Fri Oct 18 17:56:50 UTC 2019
On Thu, 2019-10-10 at 14:23 -0700, Atish Patra wrote:
> Add gz parsing logic so that booti can parse both Image
> and Image.gz to boot Linux. Currently, it is difficult to calculate
> a safe address for every board where the Image.gz can be
> decompressed.
> It is also not possible to figure out the size of the compressed file
> as well. Thus, user need to set two additional environment variables
> kernel_gz_addr_r and kernel_gz_size to make Image.gz work.
>
> Tested on HiFive Unleashed and Qemu for RISC-V.
>
> Signed-off-by: Atish Patra <atish.patra at wdc.com>
> ---
> I could not test this patch on any ARM64 devices due to lack of
> access to any ARM64 board. If anybody can test it on ARM64, that
> would be great.
> ---
> cmd/booti.c | 39 ++++++++++++++++++++++++++-
> doc/README.distro | 11 ++++++++
> doc/board/sifive/fu540.rst | 55
> ++++++++++++++++++++++++++++++++++++++
> 3 files changed, 104 insertions(+), 1 deletion(-)
>
> diff --git a/cmd/booti.c b/cmd/booti.c
> index c36b0235df8c..6c37f84833d0 100644
> --- a/cmd/booti.c
> +++ b/cmd/booti.c
> @@ -13,6 +13,9 @@
> #include <linux/kernel.h>
> #include <linux/sizes.h>
>
> +DECLARE_GLOBAL_DATA_PTR;
> +#define GZ_HEADER_0 0x1f
> +#define GZ_HEADER_1 0x8b
> /*
> * Image booting support
> */
> @@ -23,6 +26,10 @@ static int booti_start(cmd_tbl_t *cmdtp, int flag,
> int argc,
> ulong ld;
> ulong relocated_addr;
> ulong image_size;
> + uint8_t *temp;
> + ulong dest;
> + ulong dest_end;
> + unsigned long gz_len;
>
> ret = do_bootm_states(cmdtp, flag, argc, argv,
> BOOTM_STATE_START,
> images, 1);
> @@ -37,6 +44,34 @@ static int booti_start(cmd_tbl_t *cmdtp, int flag,
> int argc,
> debug("* kernel: cmdline image address = 0x%08lx\n",
> ld);
> }
>
> + temp = map_sysmem(ld, 0);
> +
> + if (*(temp) == GZ_HEADER_0 && *(temp+1) == GZ_HEADER_1) {
> + dest = env_get_ulong("kernel_gz_addr_r", 16, 0);
> + gz_len = env_get_ulong("kernel_gz_size", 16, 0);
> + if (!dest || !gz_len) {
> + puts("kernel_gz_addr_r or kernel_gz_size is not
> provided for Image.gz!\n");
> + return -EINVAL;
> + }
> + if (dest < gd->ram_base || dest > gd->ram_top) {
> + puts("kernel_gz_addr_r size is outside of dram
> range!\n");
> + return -EINVAL;
> + }
> +
> + debug("Image.gz of size = 0x%08lx will be decompressed
> at 0x%08lx\n",
> + gz_len, (ulong)dest);
> +
> + ret = image_decomp(IH_COMP_GZIP, 0, ld, IH_TYPE_KERNEL,
> + (void *)dest, (void *)ld,
> gz_len,
> + CONFIG_SYS_BOOTM_LEN,
> &dest_end);
> + if (ret)
> + return ret;
> + /* dest_end contains the uncompressed Image size */
> + memmove((void *) ld, (void *)dest, dest_end);
> + unmap_sysmem((void *)dest);
> + }
> + unmap_sysmem((void *)ld);
> +
> ret = booti_setup(ld, &relocated_addr, &image_size, false);
> if (ret != 0)
> return 1;
> @@ -96,10 +131,12 @@ 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 Linux 'Image' stored at 'addr'\n"
> + " - boot Linux 'Image' or Image.gz stored at 'addr'\n"
> "\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"
> + "\tIn order to boot from Image.gz, user have to set
> kernel_gz_addr_r\n"
> + "\tand kernel_gz_size enviornment variables beforehand.\n"
> #if defined(CONFIG_OF_LIBFDT)
> "\tSince booting a Linux kernel requires a flat device-tree,
> a\n"
> "\tthird argument providing the address of the device-tree
> blob\n"
> diff --git a/doc/README.distro b/doc/README.distro
> index ab6e6f4e74be..dbf6eef07e35 100644
> --- a/doc/README.distro
> +++ b/doc/README.distro
> @@ -246,6 +246,17 @@ kernel_addr_r:
>
> A size of 16MB for the kernel is likely adequate.
>
> +kernel_gz_addr_r:
> + Optional. This is only required if user wants to boot Linux from a
> Image.gz
> + using booti command. It represents the location in RAM where a
> Image.gz will
> + be decompressed temporarily. Once the decompression is complete,
> decompressed
> + data will be moved kernel_addr_r for booting.
> +
> +kernel_gz_size:
> + Optional. This is only required if user wants to boot Linux from a
> Image.gz
> + using booti command. It represents the size of the Image.gz file.
> The size
> + has to at least the size of Image.gz file for decompression to
> succeed.
> +
> pxefile_addr_r:
>
> Mandatory. The location in RAM where extlinux.conf will be loaded
> to prior
> diff --git a/doc/board/sifive/fu540.rst b/doc/board/sifive/fu540.rst
> index 7807f5b2c128..ad4485eb7cdb 100644
> --- a/doc/board/sifive/fu540.rst
> +++ b/doc/board/sifive/fu540.rst
> @@ -138,6 +138,10 @@ load uImage.
> => setenv netmask 255.255.252.0
> => setenv serverip 10.206.4.143
> => setenv gateway 10.206.4.1
> +
> +If you want to use a flat kernel image such as Image file
> +
> +.. code-block:: none
> => tftpboot ${kernel_addr_r} /sifive/fu540/Image
> ethernet at 10090000: PHY present at 0
> ethernet at 10090000: Starting autonegotiation...
> @@ -177,6 +181,57 @@ load uImage.
> 1.2 MiB/s
> done
> Bytes transferred = 8867100 (874d1c hex)
> +
> +Or if you want to use a compressed kernel image file such as
> Image.gz
> +
> +.. code-block:: none
> + => tftpboot ${kernel_addr_r} /sifive/fu540/Image
> + ethernet at 10090000: PHY present at 0
> + ethernet at 10090000: Starting autonegotiation...
> + ethernet at 10090000: Autonegotiation complete
> + ethernet at 10090000: link up, 1000Mbps full-duplex (lpa: 0x3c00)
> + Using ethernet at 10090000 device
> + TFTP from server 10.206.4.143; our IP address is 10.206.7.133
> + Filename '/sifive/fu540/Image'.
> + Load address: 0x84000000
> + Loading:
> #################################################################
> + ########################################################
> #########
> + ########################################################
> #########
> + ########################################################
> #########
> + ########################################################
> #########
> + ########################################################
> #########
> + ########################################################
> #########
> + ########################################################
> #########
> + ########################################################
> #########
> + ########################################################
> #########
> + ########################################################
> #########
> + ########################################################
> #########
> + ########################################################
> #########
> + ########################################################
> #########
> + ########################################################
> #########
> + ########################################################
> #########
> + ########################################################
> #########
> + ########################################################
> #########
> + ########################################################
> #########
> + ########################################################
> #########
> + ########################################################
> #########
> + ########################################################
> #########
> + ########################################################
> #########
> + ########################################################
> #########
> + ########################################################
> #########
> + ########################################################
> #########
> + ##########################################
> + 1.2 MiB/s
> + done
> + Bytes transferred = 4809458 (4962f2 hex)
> + =>setenv kernel_gz_addr_r 0x90000000
> + =>setenv kernel_gz_size 0x500000
> +
> +By this time, correct kernel image is loaded and required
> enviornment variables
> +are set. You can proceed to load the ramdisk and device tree from
> the tftp server
> +as well.
> +
> +.. code-block:: none
> => tftpboot ${ramdisk_addr_r} /sifive/fu540/uRamdisk
> ethernet at 10090000: PHY present at 0
> ethernet at 10090000: Starting autonegotiation...
Apologies for the previous email that added some mail headers in the
content because of my email client issue.
--
Regards,
Atish
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