From mboxrd@z Thu Jan 1 00:00:00 1970 From: Robin Gilks Date: Tue, 23 May 2006 12:08:37 +1200 Subject: [U-Boot-Users] Hush shell and simple calculations In-Reply-To: <200605222214.38257.antonio.dibacco@aruba.it> References: <200605222214.38257.antonio.dibacco@aruba.it> Message-ID: <44725285.1030006@tait.co.nz> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Antonio Di Bacco wrote: > I don't manage to do some simple calculations like: > > echo $((1+1)) > > Bye, > Antonio I've solved this with a new command 'eval' which is used to set a variable based on an expression. For example, I wanted to determine the start address of the kernel in flash for both 4 and 8meg parts but since its sits above U-Boot in the memory map (and U-Boot has to be 1M down from the top for high boot), it has to be calculated depending on the flash size. In this case, the new variable 'kb' contains the address of the beginning of the kernel of either 40340000 or 40740000 for either 4M or 8M devices. "eval kb $flash - c00c0000;" \ This is work I did a couple of years ago and I'm no longer on the project so I'm not able to provide a 'formal' patch. To use it, put the file cmd_eval.c into ...uboot/common/ and make the following mods in cmd_confdefs.h add #define CFG_CMD_EVAL 0x0080000000000000U /* Eval arithmetics */ in your board config add #define CONFIG_COMMANDS ( ( CONFIG_CMD_DFL \ ............... | CFG_CMD_EVAL \ in ..../uboot/common/Makefile COBJS = main.o ACEX1K.o altera.o bedbug.o \ ............ cmd_eval.o And that should be it. I hope it helps... -- Robin Gilks Senior Design Engineer Phone: (+64)(3) 357 1569 Tait Electronics Fax : (+64)(3) 359 4632 PO Box 1645 Christchurch Email : robin.gilks at tait.co.nz New Zealand ======================================================================= This email, including any attachments, is only for the intended addressee. It is subject to copyright, is confidential and may be the subject of legal or other privilege, none of which is waived or lost by reason of this transmission. If the receiver is not the intended addressee, please accept our apologies, notify us by return, delete all copies and perform no other act on the email. Unfortunately, we cannot warrant that the email has not been altered or corrupted during transmission. ======================================================================= -------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: cmd_eval.c Url: http://lists.denx.de/pipermail/u-boot/attachments/20060523/185a34b4/attachment.txt