From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michal Simek Date: Thu, 30 Jan 2014 08:35:03 +0100 Subject: [U-Boot] u-boot spl with fat32 on arm In-Reply-To: <20140129215749.GT3277@bill-the-cat> References: <52E7BD5B.8020702@monstr.eu> <20140129215749.GT3277@bill-the-cat> Message-ID: <52EA00A7.2020303@monstr.eu> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de On 01/29/2014 10:57 PM, Tom Rini wrote: > On Tue, Jan 28, 2014 at 03:23:23PM +0100, Michal Simek wrote: > >> Hi guys, >> >> I do play a little bit with u-boot spl and I am curious >> about fat32 implementation. There is MAX_CLUSTSIZE which is 65k >> and there are 3 buffers in fat.c code >> do_fat_read_at_block >> get_contents_vfatname_block >> get_dentfromdir_block >> >> All these 3 are placed to bss section. >> I have just 192k of memory for SPL that's why I tried 2 things >> 1. Place these 3 fat arrays to different memory which is working fine >> 2. Decrease MAX_CLUSTSIZE to any low value (I do use 8k). >> >> Unfortunately if I decrease MAX_CLUSTSIZE and add them to bss section >> SPL doesn't work. If I add them to a different section in front of >> or behind bss everything is just fine. >> >> That's why I have a question where can be the problem in this behaviour >> that keeping 8k MAX_CLUSTSIZE in bss section doesn't work >> and keeping 8k MAX_CLUSTSIZE out of bss section works. >> >> bss relocation is not done in SPL. > > To be clear, are you saying you cannot do this in your case? We support > CONFIG_SPL_BSS_START_ADDR / CONFIG_SPL_BSS_MAX_SIZE which is how on TI > platforms for example we put BSS into DDR, as we've configured that > before needing BSS. I am not saying that I can't place BSS to the different location out of my 192k OCM. Moving whole BSS to DDR is possible but I would rather have it in OCM. I was talking to Albert on IRC about this and I will debug it to see what's wrong. Thanks, Michal -- Michal Simek, Ing. (M.Eng), OpenPGP -> KeyID: FE3D1F91 w: www.monstr.eu p: +42-0-721842854 Maintainer of Linux kernel - Microblaze cpu - http://www.monstr.eu/fdt/ Maintainer of Linux kernel - Xilinx Zynq ARM architecture Microblaze U-BOOT custodian and responsible for u-boot arm zynq platform -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 263 bytes Desc: OpenPGP digital signature URL: