diff options
author | Stefan Roese <sr@denx.de> | 2007-07-16 13:28:47 +0200 |
---|---|---|
committer | Stefan Roese <sr@denx.de> | 2007-07-16 13:28:47 +0200 |
commit | 8f085e324ad89423314b1a529a0dd5d85c8397ad (patch) | |
tree | a165c33f92619a488756edc3261a53468c8b55b6 /doc | |
parent | 8848ec858f74ed6dab06fb6d5ddc933e0a1328bf (diff) | |
parent | 3a6cab844cf74f76639d795e0be8717e02c86af7 (diff) | |
download | u-boot-imx-8f085e324ad89423314b1a529a0dd5d85c8397ad.zip u-boot-imx-8f085e324ad89423314b1a529a0dd5d85c8397ad.tar.gz u-boot-imx-8f085e324ad89423314b1a529a0dd5d85c8397ad.tar.bz2 |
Merge with git://www.denx.de/git/u-boot.git
Diffstat (limited to 'doc')
-rw-r--r-- | doc/README.sha1 | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/doc/README.sha1 b/doc/README.sha1 new file mode 100644 index 0000000..7992f7f --- /dev/null +++ b/doc/README.sha1 @@ -0,0 +1,57 @@ +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: + CFG_MONITOR_BASE + CFG_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 "./MAKEALL pcs440ep" or a "make all" to get the U-Boot image, +the correct SHA1 sum will be automagically included in the U-Boot image. + +Heiko Schocher, 11 Jul 2007 |