From mboxrd@z Thu Jan 1 00:00:00 1970 From: York Sun Date: Mon, 16 Nov 2015 09:03:41 -0800 Subject: [U-Boot] [PATCH v1] armv8: fsl-layerscale: Rewrite reserving memory for MC and debug server In-Reply-To: <1447368895.13088.63.camel@infinera.com> References: <1447366832-16833-1-git-send-email-yorksun@freescale.com> <1447368895.13088.63.camel@infinera.com> Message-ID: <564A0C6D.3030603@freescale.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de On 11/12/2015 02:54 PM, Joakim Tjernlund wrote: > On Thu, 2015-11-12 at 14:20 -0800, York Sun wrote: >> Introduce a new function to calculate reserved memory to replace macro >> CONFIG_SYS_MEM_TOP_HIDE for more flexibility. Legacy use of this macro is >> still supported. MC and debug server are not board-specific. Move the >> reservation function to SoC file. Reduce debug server memory by 2MB to >> make room for secure memory. > > I would make sure "pram" is first to reserve memory, is it? > (previous reply wasn't caught by patchwork, adding more info) Yes, pram is used to reserve small memory from the top of u-boot memory, not necessarily the top of total memory. For example, a 32-bit u-boot with large memory. This patch deals with carving memory from the end of memory, which could be far away from u-boot top. Even in system with small memory, it is still correct, because pram reserves memory from the _top_ of u-boot and this mechanism reserved memory is hidden from u-boot. York