fit: Support compression for non-kernel components (e.g. FDT)

This patch adds support for compressing non-kernel image nodes in a FIT
image (kernel nodes could already be compressed previously). This can
reduce the size of FIT images and therefore improve boot times
(especially when an image bundles many different kernel FDTs). The
images will automatically be decompressed on load.

This patch does not support extracting compatible strings from
compressed FDTs, so it's not very helpful in conjunction with
CONFIG_FIT_BEST_MATCH yet, but it can already be used in environments
that select the configuration to load explicitly.

Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>

1 files changed, 25 insertions, 4 deletions

diff --git a/test/py/tests/test_fit.py b/test/py/tests/test_fit.py
index 49d6fea5716..8009d2907b1 100755
--- a/test/py/tests/test_fit.py
+++ b/test/py/tests/test_fit.py
@@ -24,7 +24,7 @@ base_its = '''
                         type = "kernel";
                         arch = "sandbox";
                         os = "linux";
-                        compression = "none";
+                        compression = "%(compression)s";
                         load = <0x40000>;
                         entry = <0x8>;
                 };
@@ -39,11 +39,11 @@ base_its = '''
                 };
                 fdt@1 {
                         description = "snow";
-                        data = /incbin/("u-boot.dtb");
+                        data = /incbin/("%(fdt)s");
                         type = "flat_dt";
                         arch = "sandbox";
                         %(fdt_load)s
-                        compression = "none";
+                        compression = "%(compression)s";
                         signature@1 {
                                 algo = "sha1,rsa2048";
                                 key-name-hint = "dev";
@@ -56,7 +56,7 @@ base_its = '''
                         arch = "sandbox";
                         os = "linux";
                         %(ramdisk_load)s
-                        compression = "none";
+                        compression = "%(compression)s";
                 };
                 ramdisk@2 {
                         description = "snow";
@@ -221,6 +221,10 @@ def test_fit(u_boot_console):
             print(data, file=fd)
         return fname
 
+    def make_compressed(filename):
+        util.run_and_log(cons, ['gzip', '-f', '-k', filename])
+        return filename + '.gz'
+
     def find_matching(text, match):
         """Find a match in a line of text, and return the unmatched line portion
 
@@ -312,6 +316,7 @@ def test_fit(u_boot_console):
         loadables1 = make_kernel('test-loadables1.bin', 'lenrek')
         loadables2 = make_ramdisk('test-loadables2.bin', 'ksidmar')
         kernel_out = make_fname('kernel-out.bin')
+        fdt = make_fname('u-boot.dtb')
         fdt_out = make_fname('fdt-out.dtb')
         ramdisk_out = make_fname('ramdisk-out.bin')
         loadables1_out = make_fname('loadables1-out.bin')
@@ -326,6 +331,7 @@ def test_fit(u_boot_console):
             'kernel_addr' : 0x40000,
             'kernel_size' : filesize(kernel),
 
+            'fdt' : fdt,
             'fdt_out' : fdt_out,
             'fdt_addr' : 0x80000,
             'fdt_size' : filesize(control_dtb),
@@ -351,6 +357,7 @@ def test_fit(u_boot_console):
             'loadables2_load' : '',
 
             'loadables_config' : '',
+            'compression' : 'none',
         }
 
         # Make a basic FIT and a script to load it
@@ -417,6 +424,20 @@ def test_fit(u_boot_console):
             check_equal(loadables2, loadables2_out,
                         'Loadables2 (ramdisk) not loaded')
 
+        # Kernel, FDT and Ramdisk all compressed
+        with cons.log.section('(Kernel + FDT + Ramdisk) compressed'):
+            params['compression'] = 'gzip'
+            params['kernel'] = make_compressed(kernel)
+            params['fdt'] = make_compressed(fdt)
+            params['ramdisk'] = make_compressed(ramdisk)
+            fit = make_fit(mkimage, params)
+            cons.restart_uboot()
+            output = cons.run_command_list(cmd.splitlines())
+            check_equal(kernel, kernel_out, 'Kernel not loaded')
+            check_equal(control_dtb, fdt_out, 'FDT not loaded')
+            check_equal(ramdisk, ramdisk_out, 'Ramdisk not loaded')
+
+
     cons = u_boot_console
     try:
         # We need to use our own device tree file. Remember to restore it