arm-bsp/corstone1000: use compressed kernel image

To fit the kernel image into the allotted space, a compressed kernel
image is now needed.  Use the Image.gz from the kernel build process
and change the relevant places to use the new image name.  This also
necessitates adding an unzip command to u-boot to uncompress it to
memory (and the loadm is still needed to setup the efi mem boot device).
Also, the unzipped image is larger than before.  So, increase the size
that loadm is copying.

This change shrinks the initramfs bundle size from 12MB to 4.8MB

Signed-off-by: Jon Mason <jon.mason@arm.com>
Signed-off-by: Abdellatif El Khlifi <abdellatif.elkhlifi@arm.com>
Signed-off-by: Jon Mason <jon.mason@arm.com>

meta-arm-bsp/conf/machine/include/corstone1000.inc

@@ -48,7 +48,7 @@ EXTRA_IMAGEDEPENDS += "secure-partitions"
 # Linux kernel
 PREFERRED_PROVIDER_virtual/kernel:forcevariable = "linux-yocto"
 PREFERRED_VERSION_linux-yocto = "5.15%"
-KERNEL_IMAGETYPE = "Image"
+KERNEL_IMAGETYPE = "Image.gz"
 
 INITRAMFS_IMAGE_BUNDLE ?= "1"
 

meta-arm-bsp/recipes-bsp/u-boot/u-boot/corstone1000/0028-corstone1000-use-a-compressed-kernel.patch

@@ -0,0 +1,35 @@
+From 348cdb4bab63ad0a6b373396ad522f1bcc2d6bdb Mon Sep 17 00:00:00 2001
+From: Abdellatif El Khlifi <abdellatif.elkhlifi@arm.com>
+Date: Mon, 17 Oct 2022 15:41:20 +0100
+Subject: [PATCH] corstone1000: use a compressed kernel
+
+The corstone1000 kernel has become too large to fit in the available
+storage.  Swtiching to a compressed kernel avoids the problem, but
+requires uncompressing it.  Add this decompression to the default boot
+instructions.
+
+Signed-off-by: Jon Mason <jon.mason@arm.com>
+Signed-off-by: Abdellatif El Khlifi <abdellatif.elkhlifi@arm.com>
+Upstream-Status: Pending [Not submitted to upstream yet]
+
+---
+ include/configs/corstone1000.h | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/include/configs/corstone1000.h b/include/configs/corstone1000.h
+index d9855bf91e..a66e3a8c10 100644
+--- a/include/configs/corstone1000.h
++++ b/include/configs/corstone1000.h
+@@ -126,7 +126,8 @@
+ #define CONFIG_BOOTCOMMAND								\
+ 				"run retrieve_kernel_load_addr;"			\
+ 				"echo Loading kernel from $kernel_addr to memory ... ;"	\
+-				"loadm $kernel_addr $kernel_addr_r 0xc00000;"		\
++				"unzip $kernel_addr 0x90000000;"                        \
++				"loadm 0x90000000 $kernel_addr_r 0xd00000;"		\
+ 				"usb start; usb reset;"					\
+ 				"run distro_bootcmd;"					\
+ 				"bootefi $kernel_addr_r $fdtcontroladdr;"
+-- 
+2.17.1
+

meta-arm-bsp/recipes-bsp/u-boot/u-boot_%.bbappend

@@ -44,6 +44,7 @@ SRC_URI:append:corstone1000 = " \
         file://0025-efi_loader-send-bootcomplete-message-to-secure-encla.patch \
         file://0026-efi_loader-fix-null-pointer-exception-with-get_image.patch \
         file://0027-arm-corstone1000-add-mmc-for-fvp.patch \
+        file://0028-corstone1000-use-a-compressed-kernel.patch \
       "
 
 #

meta-arm-bsp/wic/corstone1000-image.corstone1000.wks

@@ -12,4 +12,4 @@ part --source rawcopy --sourceparams="file=tfm_s_signed.bin" --align 1 --no-tabl
 part --source rawcopy --sourceparams="file=signed_fip-corstone1000.bin" --align 1 --no-table --fixed-size 2
 
 # Rawcopy of kernel with initramfs
-part --source rawcopy --sourceparams="file=Image-initramfs-${MACHINE}.bin" --no-table --fixed-size 12
+part --source rawcopy --sourceparams="file=Image.gz-initramfs-${MACHINE}.bin" --no-table --fixed-size 12