Module Name: src Committed By: rin Date: Mon Oct 11 02:30:01 UTC 2021
Modified Files: src/sys/arch/hpcsh/dev/hd64461: hd64461pcmcia.c Log Message: Fix workaround for SH-3 PCMCIA bug in accordance with description found in TECH I vol. 14 (CQ Publishing, Tokyo, 2002, in Japanese), as well as experiment on real hardware: Byte-access to area 6 becomes word-access (both CE1# and CE2# are wrongly asserted), if preceding access is word-wise. Inserting a dummy byte-access works around the problem. Area 5 is not affected. Therefore, (1) Insert a dummy byte-read before all byte-wise operations. (2) Restrict the workaround to area 6 (channel 0), and rename fixup_sh3_pcmcia_area() to fixup_sh3_pcmcia_area6() for clarity. Also, we used to use 0xba000000 (== HD64461_PCC0_IOBASE) as target for the dummy read. However, this can modify device states, which breaks ep(4) at least. Thus, (3) Use HD64461_PCC0_MEMBASE as target for the dummy read. This is assigned to attribute memory space, and byte-read should be harmless. To generate a diff of this commit: cvs rdiff -u -r1.54 -r1.55 src/sys/arch/hpcsh/dev/hd64461/hd64461pcmcia.c Please note that diffs are not public domain; they are subject to the copyright notices on the relevant files.