sorry - my fault - I failed to grasp the meaning of itest
This now works
while itest 1 == 1 ; do ; mmcinit && ext2load mmc 0:1 0x10400000 /boot/uImage && bootm 0x10400000 ; done
I could do with a literal "true" - I tried 'true' but that wasn't right - is there a suitable constant value?
I'd still love to find some teaching stuff on this - I can't keep bothering important people like you :-)
David
In article <memo.20091022142208.2092E@postmaster+dexdyne.com.cix.co.uk>, from_denx_uboot@dexdyne.com (David Collier) wrote:
*From:* "David Collier" from_denx_uboot@dexdyne.com *To:* u-boot@lists.denx.de *Date:* Thu, 22 Oct 2009 14:22 +0100 (BST)
OK I have changed it to
while 1==1 ; do ; mmcinit && ext2load mmc 0:1 0x10400000 /boot/uImage && bootm 0x10400000 ; done
and if I do run bootcmd it simply says "unknown command 1==1"
so I'm still lost....
I know I have hush installed, cosz if I do your multi-line-version I get the prompt.
All I saw about hush was "bourne-compatible", and "provides while...do..done" scripting.
I failed to find a proper manual... probably for lack of effort, but I've just googled again and nothing springs up..
Could you possibly point me at any hush documentation ?
Many thanks
David
In article 20091022113139.DB6961A00B@gemini.denx.de, wd@denx.de (Wolfgang Denk) wrote:
*From:* Wolfgang Denk wd@denx.de *To:* from_denx_uboot@dexdyne.com *CC:* u-boot@lists.denx.de *Date:* Thu, 22 Oct 2009 13:31:39 +0200
Dear "David Collier",
In message <memo.20091022093854.2092B@postmaster+dexdyne.com.cix.co.uk> you wrote:
what I'd like to do is put it in a while loop - this is an embedded system and it has nothing better to do than to try again.
but if I set up
bootcmd=while [ .... ]; do ; mmcinit && ext2load mmc 0:1 0x10400000 /boot/uImage && bootm 0x10400000 ; done
no matter what I have put in or around the [..] area, it barfs.
Did you understand why it barfs? The '[' is actually a command name, which usually is a synonym for the 'test' command. U-Boot does not provide such a coimmand, and the hush shell does not provide it as shell builtin either, so this _must_ fail.
I am surprised that you did not find this out yourself - U-Boot should issue a pretty clear error message, something like
Unknown command '[' - try 'help'
Could anyone show me a working example of a hush while loop please? Or tell me what I'm doing wrong :-)
Here is a (tested and working) example:
=> mw 200000 0 => while itest *200000 == 0 ; do
tftp 200000 tqm5200/uImage echo === done ==== done
Using FEC ETHERNET device TFTP from server 192.168.1.1; our IP address is 192.168.160.4 Filename 'tqm5200/uImage'. Load address: 0x200000 Loading: #################################################################
############################################################ done Bytes transferred = 1830503 (1bee67 hex) === done ==== =>
Best regards,
Wolfgang Denk
-- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de "Where shall I begin, please your Majesty?" he asked. "Begin at the beginning," the King said, gravely, "and go on till you come to the end: then stop." - Alice's Adventures in Wonderland, Lewis Carroll
Collier
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