util/rockchip: Port make_idb.py to python3

BUG=chromium:1023662
TEST=buildbot pass
TEST=1. Use python2 script
     2. Run `emerge-kevin coreboot` twice, so we get bootblock.bin.1
     and bootblock.bin.2
     3. Run `xxd` on these two bootblock so we get bootblock.bin.1.hex
     and bootblock.bin.2.hex
     4. `diff bootblock.bin.1.hex bootblock.bin.2.hex` and record the
     difference. (at least, the time info changes)
     5. Migrate to python3
     6. Similar steps, we get bootblock.bin.py3.hex
     7. `diff bootblock.bin.1.hex bootblock.bin.py3.hex`, the difference
     is similar. (time info, git hash changes)

Signed-off-by: Yilin Yang <kerker@google.com>
Change-Id: I04253084ec9b65310c52598b629390051cd2172b
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45447
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

2 files changed, 25 insertions, 24 deletions

diff --git a/util/rockchip/description.md b/util/rockchip/description.md
index 3eed7a6899..e482d1eb1e 100644
--- a/util/rockchip/description.md
+++ b/util/rockchip/description.md
@@ -1 +1 @@
-Generate Rockchip idblock bootloader. `Python2`
+Generate Rockchip idblock bootloader. `Python3`
diff --git a/util/rockchip/make_idb.py b/util/rockchip/make_idb.py
index 12cd130bc5..ff82e7325a 100755
--- a/util/rockchip/make_idb.py
+++ b/util/rockchip/make_idb.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python3
 # SPDX-License-Identifier: BSD-2-Clause
 
 import struct
@@ -7,7 +7,7 @@ from io import SEEK_SET, SEEK_END
 
 class IDBTool:
   def __init__(self):
-    print "Initialize IDBTool"
+    print("Initialize IDBTool")
 
   def p_rc4(self, buf, length):
     key = (124,78,3,4,85,5,9,7,45,44,123,56,23,13,23,17)
@@ -25,7 +25,7 @@ class IDBTool:
       j = (j + S[i]) % 256
       temp = S[i]; S[i] = S[j]; S[j] = temp
       k = (S[i] + S[j]) % 256
-      buf[x] = struct.pack('B', ord(buf[x]) ^ S[k])
+      buf[x] = struct.pack('B', buf[x] ^ S[k])[0]
 
   def makeIDB(self, chip, from_file, to_file, rc4_flag = False, align_flag = False):
     try:
@@ -45,17 +45,18 @@ class IDBTool:
     data_len = len(data)
     SECTOR_SIZE = 512
     PAGE_ALIGN  = 4
-    sectors = (data_len + 4 - 1) / SECTOR_SIZE + 1
-    pages = (sectors - 1) / PAGE_ALIGN + 1
-    sectors = pages * PAGE_ALIGN;
+    sectors = (data_len + 4 - 1) // SECTOR_SIZE + 1
+    pages = (sectors - 1) // PAGE_ALIGN + 1
+    sectors = pages * PAGE_ALIGN
 
-    buf = [B'\0'] * sectors * SECTOR_SIZE
-    buf[:4] = chip
+    buf = bytearray(sectors * SECTOR_SIZE)
+    assert len(chip) == 4
+    buf[:4] = chip.encode('ascii')
     buf[4 : 4+data_len] = data
 
-    idblock = [B'\0'] * 4 * SECTOR_SIZE
-    blank   = [B'\0'] * 4 * SECTOR_SIZE
-    idblock[:4] = ['\x55', '\xAA', '\xF0', '\x0F']
+    idblock = bytearray(4 * SECTOR_SIZE)
+    blank   = bytearray(4 * SECTOR_SIZE)
+    idblock[:4] = b'\x55\xAA\xF0\x0F'
 
     if (not rc4_flag):
       idblock[8:12] = struct.pack("<I", 1)
@@ -65,8 +66,8 @@ class IDBTool:
         self.p_rc4(list_tmp, SECTOR_SIZE)
         buf[SECTOR_SIZE*i : SECTOR_SIZE*(i+1)] = list_tmp
 
-    idblock[12:16] = struct.pack("<HH", 4, 4);
-    idblock[506:510] = struct.pack("<HH", sectors, sectors);
+    idblock[12:16] = struct.pack("<HH", 4, 4)
+    idblock[506:510] = struct.pack("<HH", sectors, sectors)
     self.p_rc4(idblock, SECTOR_SIZE)
 
     try:
@@ -76,25 +77,25 @@ class IDBTool:
 
     try:
       if (align_flag):
-        fout.write(''.join(idblock))
-        fout.write(''.join(blank))
+        fout.write(idblock)
+        fout.write(blank)
 
-        for s in xrange(0, sectors * SECTOR_SIZE, PAGE_ALIGN * SECTOR_SIZE):
-          fout.write(''.join(buf[s : s + PAGE_ALIGN * SECTOR_SIZE]))
-          fout.write(''.join(blank))
+        for s in range(0, sectors * SECTOR_SIZE, PAGE_ALIGN * SECTOR_SIZE):
+          fout.write(buf[s : s + PAGE_ALIGN * SECTOR_SIZE])
+          fout.write(blank)
       else:
-        fout.write(''.join(idblock))
-        fout.write(''.join(buf))
+        fout.write(idblock)
+        fout.write(buf)
       fout.flush()
     except:
       sys.exit("Failed to write data to : " + to_file)
     finally:
       fout.close()
-    print "DONE"
+    print("DONE")
 
 def usage():
-  print "Usage: make_idb.py [--chip=RKXX] [--enable-rc4] [--enable-align] [--to=out] --from=in"
-  print "       --chip: default is RK32"
+  print("Usage: make_idb.py [--chip=RKXX] [--enable-rc4] [--enable-align] [--to=out] --from=in")
+  print("       --chip: default is RK32")
 
 if __name__ == '__main__':
   rc4_flag = align_flag = False