From: Adrian Cox <adrian@humboldt•co.uk>
To: linuxppc-dev@lists•linuxppc.org
Subject: [PATCH] Allow small areas in io_block_mapping
Date: Fri, 16 Nov 2001 15:21:48 +0000 [thread overview]
Message-ID: <3BF52F0C.7020608@humboldt.co.uk> (raw)
[-- Attachment #1: Type: text/plain, Size: 324 bytes --]
The attached patch stops io_block_mapping() from attempting to use BATs
for areas too small to fit in a BAT. (On the port I'm currently
developing, the board uses high-order address lines to distinguish
between register groups, and I'm trying to allocate a page for each group.)
--
Adrian Cox http://www.humboldt.co.uk/
[-- Attachment #2: pgtable.patch --]
[-- Type: text/plain, Size: 476 bytes --]
===== arch/ppc/mm/pgtable.c 1.7 vs edited =====
--- 1.7/arch/ppc/mm/pgtable.c Sun Nov 4 18:54:46 2001
+++ edited/arch/ppc/mm/pgtable.c Fri Nov 16 15:12:48 2001
@@ -242,7 +242,7 @@
/*
* Use a BAT for this if possible...
*/
- if (io_bat_index < 2 && is_power_of_2(size)
+ if (io_bat_index < 2 && is_power_of_2(size) && size >= 0x20000
&& (virt & (size - 1)) == 0 && (phys & (size - 1)) == 0) {
setbat(io_bat_index, virt, phys, size, flags);
++io_bat_index;
next reply other threads:[~2001-11-16 15:21 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-11-16 15:21 Adrian Cox [this message]
2001-11-16 16:14 ` [PATCH] Allow small areas in io_block_mapping Dan Malek
2001-11-16 16:39 ` Adrian Cox
2001-11-16 16:57 ` Dan Malek
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