On 24 Dec 2014 at 19:00, Roger Burrows wrote: > Mark Duckworth reported a problem on the ACP forum when trying to launch MiNT > from a DOS FAT partition under EmuTOS. MiNT did not boot, because the startup > code refused to login his big DOS-style FAT partitions. Looking at the > relevant MiNT code, I see that MiNT's FATFS will not login a drive where the > cluster size in bytes is bigger than cache.max_size. In init_block_IO(), > cache.max_size is calculated as: > max(MIN_BLOCK,2*max_sect_siz) > where MIN_BLOCK is 8192, and max_sect_siz is taken from the AHDI pun_info > structure, where it is the maximum logical sector size on any of the host's > drives. For a system with only DOS-style partitions, this will be 512 > bytes. > > So if you try to run MiNT from EmuTOS running on a DOS-style partition, > max_sect_siz will be set to 512, and thus cache.max_size to 8192. Accessing a > partition with clusters larger than 8192 bytes (i.e. a partition larger than > 512MB) is not possible, so MiNT will not start. > Attached is a patch to correct this. NOTE: due to lack of a suitable setup, this has not been tested! It compiles clean and looks straightforward, but I've been around too long to assume that makes it bug-free. Roger
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File: MIN_BLOCK.patch
Date: 11 Jan 2015, 19:23
Size: 1830 bytes.
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MIN_BLOCK.patch
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