From 13c501e69c3fba3ca0651abcc4aa7c9091fda70a Mon Sep 17 00:00:00 2001 From: Josh Boyer Date: Fri, 16 May 2008 00:43:46 +1000 Subject: [PATCH] [POWERPC] 4xx: Workaround for CHIP_11 Errata The PowerPC 440EP, 440GR, 440EPx, and 440GRx chips have an issue that causes the PLB3-to-PLB4 bridge to wait indefinitely for transaction requests that cross the end-of-memory-range boundary. Since the DDR controller only returns the valid portion of a read request, the bridge will prevent other PLB masters from completing their transactions. This implements the recommended workaround for this errata for chips that use older versions of firmware that do not already handle it. The last 4KiB of memory are hidden from the kernel to prevent the problem transactions from occurring. Signed-off-by: Josh Boyer Acked-by: Stefan Roese Signed-off-by: Josh Boyer --- arch/powerpc/boot/4xx.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/arch/powerpc/boot/4xx.c b/arch/powerpc/boot/4xx.c index 758edf1c58..5c878436f3 100644 --- a/arch/powerpc/boot/4xx.c +++ b/arch/powerpc/boot/4xx.c @@ -21,6 +21,25 @@ #include "reg.h" #include "dcr.h" +static unsigned long chip_11_errata(unsigned long memsize) +{ + unsigned long pvr; + + pvr = mfpvr(); + + switch (pvr & 0xf0000ff0) { + case 0x40000850: + case 0x400008d0: + case 0x200008d0: + memsize -= 4096; + break; + default: + break; + } + + return memsize; +} + /* Read the 4xx SDRAM controller to get size of system memory. */ void ibm4xx_sdram_fixup_memsize(void) { @@ -34,6 +53,7 @@ void ibm4xx_sdram_fixup_memsize(void) memsize += SDRAM_CONFIG_BANK_SIZE(bank_config); } + memsize = chip_11_errata(memsize); dt_fixup_memory(0, memsize); } @@ -199,6 +219,7 @@ void ibm4xx_denali_fixup_memsize(void) bank = 4; /* 4 banks */ memsize = cs * (1 << (col+row)) * bank * dpath; + memsize = chip_11_errata(memsize); dt_fixup_memory(0, memsize); } -- 2.39.5