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

www.dexdyne.com

Dear =?iso-8859-1?Q?=D6rjan_Friberg?=,

In message A646FE253FDF3D4F9742732015311CD44F7E10@fg-server.flatfrog.local you wrote:

...

OK I have changed it to

while 1==1 ; do ; mmcinit && ext2load mmc 0:1 0x10400000 /boot/uImage && bootm 0x10400000 ; done

Replace the "1==1" with ":" and skip the ";" after "do"

I recommend to try things out before posting:

=> while : ; do echo foo ; done Unknown command ':' - try 'help' =>

U-Boot does not know (yet) about the ':' command.

Best regards,

Wolfgang Denk

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

www.dexdyne.com _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot

Collier

www.dexdyne.com

Not yet - a patch to add "true" and "false" commands was submitted a week ago and will make it into the next release - see http://thread.gmane.org/gmane.comp.boot-loaders.u-boot/69887/focus=6 9886

excellent - I'll keep the clumsy-but-working version then.

...

I'd still love to find some teaching stuff on this - I can't keep bothering important people like you :-)

Try: "man sh" :-)

OK... TVM

I've worked with bash, and naively assumed that that syntax was standard.

David

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 News is what a chap who doesn't care much about anything wants to read. And it's only news until he's read it. After that it's dead. - Evelyn Waugh _Scoop_ (1938) bk. 1, ch. 5

David Collier

www.dexdyne.com

Dear "David Collier",

In message <memo.20091022142208.2092E@postmaster+dexdyne.com.cix.co.uk> you wrote:

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....

Well, this is not valid shell syntax. Bash will reject this, too:

bash: 1==1: command not found

[after correcting the other syntax errors, or course(

I failed to find a proper manual... probably for lack of effort, but I've just googled again and nothing springs up..

So just use standard POSIX scripting, and/or try the syntax in a real shell.

Could you possibly point me at any hush documentation ?

I'm afraid there ain't any. But - what for? It's just a shell ;-)

Best regards,

Wolfgang Denk