From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from nausicaa2.coritel.it (host254-130-static.190-82-b.business.telecomitalia.it [82.190.130.254]) by ozlabs.org (Postfix) with ESMTP id 512E8DE1B6 for ; Thu, 17 Jul 2008 21:19:43 +1000 (EST) Message-ID: <487F2B4C.7070409@coritel.it> Date: Thu, 17 Jul 2008 13:21:48 +0200 From: Marco Stornelli MIME-Version: 1.0 To: Ruksen INANIR Subject: Re: increase lowmem value for ppc References: <487F1FD2.7090909@gmail.com> <487F297B.4070806@coritel.it> In-Reply-To: <487F297B.4070806@coritel.it> Content-Type: text/plain; charset=us-ascii; format=flowed Cc: linuxppc-embedded@ozlabs.org List-Id: Linux on Embedded PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Marco Stornelli ha scritto: > Ruksen INANIR ha scritto: >> >> Is there a way to increase the lowmem value for ppc. The MAX_LOW_MEM >> is defined as max 768 MB. But a value around 1.5 G works with no >> problem. But when i try to increase this value to 1520 or more, kernel >> complaints about no space for memory allocation when loading kernel >> modules. >> I do not want to use HIGHMEM config. What is the max lowmem value for >> a ppc system? What other setting are needed to use 1520 MB (or more) >> as lowmem . >> The ppc card has 2G on board memory. 2.4.22 kernel is used. >> >> Thanks >> _______________________________________________ >> Linuxppc-embedded mailing list >> Linuxppc-embedded@ozlabs.org >> https://ozlabs.org/mailman/listinfo/linuxppc-embedded >> > With 32-bit arch you may not use more than 1GB to map the memory (minus > some space for some kernel operation). The value of 768MB was not there > by chance. > Only an additional comment: I meant with the address splitting 3G/1G. To map more than 1GB, you have to change the splitting 2G/2G for example. -- Marco Stornelli Embedded Software Engineer CoRiTeL - Consorzio di Ricerca sulle Telecomunicazioni http://www.coritel.it marco.stornelli@coritel.it +39 06 72582838