From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-yw0-x229.google.com (mail-yw0-x229.google.com [IPv6:2607:f8b0:4002:c05::229]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 8CCAD81D39 for ; Wed, 2 Nov 2016 16:22:15 -0700 (PDT) Received: by mail-yw0-x229.google.com with SMTP id h14so28527270ywa.2 for ; Wed, 02 Nov 2016 16:22:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=from:mime-version:thread-index:date:message-id:subject:to; bh=nekXYcUk8R0KqN+vXuSFGXIIQoP6mET8dilj1HREu10=; b=VS4E4eMaU43kdooPHxBWO5sN3hX2Ms3iZdt4+O/d8QEiS0K5LW7scgrS8CDoy27Fhx A0TRUAXcxIaqnXmYCQGommzYUhm362S0kNhTURQVoLTTsjt5Z+0szt8AD6vhJIuR/7q/ NFVtHas6g7c01lOK4cEQuULG9IZ+TmVinB0U4= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:mime-version:thread-index:date:message-id :subject:to; bh=nekXYcUk8R0KqN+vXuSFGXIIQoP6mET8dilj1HREu10=; b=KvlPyHTe2A5ogHXm+z0HSqjz3s1leDBWiapZ36y5GT0oMg0Yd15COnUteMIAAdVskU iyfCpCBmB5Bchd378BLB8KkLhFYxA6cRDcPc1GhVFnDP1knrPhayU9YJ8rBEgyOn806d AcrDdj+p4i+Cql8wq9M27iONStg/bhYRJXpCfX21f0O/ecWtgpI3ZDvseDbM6YaQh0zu xVKrz9eKQcppEjdAnRR0qvt+ZZqXW7AIzQX2bt6rILYpdZAJb4z333RZpMPtgWwJaJV5 LYDJW0oR33Qe/pTJcT9oPx2exb4HTOaaxFhKVsaW8n51COV/xTsux77v6ZfrshYKS6GC KEyQ== X-Gm-Message-State: ABUngvdY+H2SMG08fQyeky8EtWJtB4scE6eSTRxxdYKbzXZZRXTEqMu/DbVX+uYWsxzMjCqibf47nFZgENtrieqz X-Received: by 10.129.152.211 with SMTP id p202mr5683289ywg.314.1478128936093; Wed, 02 Nov 2016 16:22:16 -0700 (PDT) From: Vladimir Olovyannikov MIME-Version: 1.0 X-Mailer: Microsoft Outlook 14.0 Thread-Index: AdI1X/DsJnnmzYhDRdqiRGuurdHLGA== Date: Wed, 2 Nov 2016 16:22:15 -0700 Message-ID: <29903b6e7027d53f23a049eec5c42604@mail.gmail.com> To: edk2-devel@lists.01.org Subject: Minimum RAM requirements for UEFI (AARCH64) X-BeenThere: edk2-devel@lists.01.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: EDK II Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 02 Nov 2016 23:22:15 -0000 Content-Type: text/plain; charset=UTF-8 Hello, I could not find this in the spec, but what is the minimum RAM required for the UEFI? We are at the very early stage right now, and DDR will not be available for a while. The platform is AARCH64-based. Can I fit UEFI into 8MB of RAM (actually I might get 64MB, so can I fit it into 64MB)? Because the target platform is not yet available, I experimented with an ref. platform (also AARCH64, slightly older) shrinking SystemMemorySize. I tried to cut off as many things as possible (no Shell, very limited set of drivers), tried to replace real libraries with NULL "stubs", yet I cannot get UEFI running with less than 128MB of RAM... I would appreciate any advice... Thank you, Vladimir