doc: Remove README.sha1 file

The contents of README.sha1 only refer to process around verification
of the pcs440ep board firmware in flash. The device was removed in
commit 242836a893ae ("powerpc: ppc4xx: remove pcs440ep support") in
2015 so this readme isn't really relevant anymore so can be removed.

Signed-off-by: Peter Robinson <pbrobinson@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

diff --git a/doc/README.sha1 b/doc/README.sha1
deleted file mode 100644 (file)
index f178f37..0000000
--- a/doc/README.sha1
+++ /dev/null
@@ -1,58 +0,0 @@
-SHA1 usage:
------------
-
-In the U-Boot Image for the pcs440ep board is a SHA1 checksum integrated.
-This SHA1 sum is used, to check, if the U-Boot Image in Flash is not
-corrupted.
-
-The following command is available:
-
-=> help sha1
-sha1 address len [addr]  calculate the SHA1 sum [save at addr]
-     -p calculate the SHA1 sum from the U-Boot image in flash and print
-     -c check the U-Boot image in flash
-
-"sha1 -p"
-       calculates and prints the SHA1 sum, from the Image stored in Flash
-
-"sha1 -c"
-       check, if the SHA1 sum from the Image stored in Flash is correct
-
-
-It is possible to calculate a SHA1 checksum from a memoryrange with:
-
-"sha1 address len"
-
-If you want to store a new Image in Flash for the pcs440ep board,
-which has no SHA1 sum, you can do the following:
-
-a) cp the new Image on a position in RAM (here 0x300000)
-   (for this example we use the Image from Flash, stored at 0xfffa0000 and
-    0x60000 Bytes long)
-
-"cp.b fffa0000 300000 60000"
-
-b) Initialize the SHA1 sum in the Image with 0x00
-   The SHA1 sum is stored in Flash at:
-                          CONFIG_SYS_MONITOR_BASE + CONFIG_SYS_MONITOR_LEN + SHA1_SUM_POS
-   for the pcs440ep Flash:      0xfffa0000 +         0x60000 +        -0x20
-                           = 0xffffffe0
-   for the example in RAM:        0x300000 +         0x60000 +        -0x20
-                           = 0x35ffe0
-
-   note: a SHA1 checksum is 20 bytes long.
-
-"mw.b 35ffe0 0 14"
-
-c) now calculate the SHA1 sum from the memoryrange and write
-   the calculated checksum at the right place:
-
-"sha1 300000 60000 35ffe0"
-
-Now you have a U-Boot-Image for the pcs440ep board with the correct SHA1 sum.
-
-If you do a "buildman -k pcs440ep" or a "make all" to get the U-Boot image,
-which will be found in ../current/ipam390/ - the correct SHA1 sum will be
-automagically included in the U-Boot image.
-
-Heiko Schocher, 11 Jul 2007