RE: [PATCH v3 4/5] rpi: Update environment to support booti and large initrd

["Jaehoon Chung" <jh80.chung@samsung.com>]

> -----Original Message-----
> From: U-Boot <u-boot-bounces@lists.denx.de> On Behalf Of Simon Glass
> Sent: Tuesday, December 10, 2024 4:55 AM
> To: U-Boot Mailing List <u-boot@lists.denx.de>
> Cc: Tom Rini <trini@konsulko.com>; Stephen Warren <swarren@wwwdotorg.org>; Stephen Warren
> <swarren@nvidia.com>; Matthias Brugger <mbrugger@suse.com>; Simon Glass <sjg@chromium.org>; Peter
> Robinson <pbrobinson@gmail.com>
> Subject: [PATCH v3 4/5] rpi: Update environment to support booti and large initrd
>
> The existing values don't provide for decompressing an arm64 boot-image.
> Add those values and move things apart a bit so that a 50MB kernel can be
> accommodated.
>
> Signed-off-by: Simon Glass <sjg@chromium.org>


Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
Tested-by: Jaehoon Chung <jh80.chung@samsung.com>

> ---
>
> Changes in v3:
> - Update the comment block with the new values, including compression
>
>  board/raspberrypi/rpi/rpi.env | 27 ++++++++++++++++-----------
>  1 file changed, 16 insertions(+), 11 deletions(-)
>
> diff --git a/board/raspberrypi/rpi/rpi.env b/board/raspberrypi/rpi/rpi.env
> index 9b9fad82828..9ac9d6768ca 100644
> --- a/board/raspberrypi/rpi/rpi.env
> +++ b/board/raspberrypi/rpi/rpi.env
> @@ -48,28 +48,33 @@ dfu_alt_info+=zImage fat 0 1
>   *
>   * scriptaddr and pxefile_addr_r can be pretty much anywhere that doesn't
>   * conflict with something else. Reserving 1M for each of them at
> - * 0x02400000-0x02500000 and 0x02500000-0x02600000 should be plenty.
> + * 0x05400000-0x05500000 and 0x05500000-0x05600000 should be plenty.
>   *
>   * On ARM, both the DTB and any possible initrd must be loaded such that they
>   * fit inside the lowmem mapping in Linux. In practice, this usually means not
>   * more than ~700M away from the start of the kernel image but this number can
>   * be larger OR smaller depending on e.g. the 'vmalloc=xxxM' command line
>   * parameter given to the kernel. So reserving memory from low to high
> - * satisfies this constraint again. Reserving 1M at 0x02600000-0x02700000 for
> - * the DTB leaves rest of the free RAM to the initrd starting at 0x02700000.
> - * Even with the smallest possible CPU-GPU memory split of the CPU getting
> - * only 64M, the remaining 25M starting at 0x02700000 should allow quite
> - * large initrds before they start colliding with U-Boot.
> + * satisfies this constraint again. Reserving 1M at 0x05600000-0x05700000 for
> + * the DTB leaves rest of the free RAM to the initrd starting at 0x05700000.
> + * This means that the board must have at least 128MB of RAM available to
> + * U-Boot, more if the initrd is large.
>   *
> - * Limit bootm_size to 512MB so that all boot images stay within the bottom
> + * For compressed kernels, the maximum size is just under 32MB, with an area for
> + * decompression at 0x02000000 with space for 52MB, which is plenty for current
> + * kernels.
> + *
> + * limit bootm_size to 512MB so that all boot images stay within the bottom
>   * 512MB of memory
>   */
>  bootm_size=0x20000000
>
>  kernel_addr_r=0x00080000
> -scriptaddr=0x02400000
> -pxefile_addr_r=0x02500000
> -fdt_addr_r=0x02600000
> -ramdisk_addr_r=0x02700000
> +kernel_comp_addr_r=0x02000000
> +kernel_comp_size=0x03400000
> +scriptaddr=0x05400000
> +pxefile_addr_r=0x05500000
> +fdt_addr_r=0x05600000
> +ramdisk_addr_r=0x05700000
>
>  boot_targets=mmc usb pxe dhcp
> --
> 2.34.1