* Linux 2.6 sources for MPC852T processor @ 2006-04-26 9:50 Chandrasekhar Nagaraj 2006-04-26 11:50 ` David Jander 0 siblings, 1 reply; 6+ messages in thread From: Chandrasekhar Nagaraj @ 2006-04-26 9:50 UTC (permalink / raw) To: linuxppc-embedded [-- Attachment #1: Type: text/html, Size: 668 bytes --] ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Linux 2.6 sources for MPC852T processor 2006-04-26 9:50 Linux 2.6 sources for MPC852T processor Chandrasekhar Nagaraj @ 2006-04-26 11:50 ` David Jander 2006-04-26 23:32 ` Dan Malek 0 siblings, 1 reply; 6+ messages in thread From: David Jander @ 2006-04-26 11:50 UTC (permalink / raw) To: linuxppc-embedded, chandrasekhar_n On Wednesday 26 April 2006 11:50, Chandrasekhar Nagaraj wrote: > <DIV style="font-family:Arial,sans-serif;"><DIV>Hi,</DIV> > <DIV>I have a customized board based on the MPC852T based processor.</DIV> > <DIV>I intend to develop a BSP for this board.</DIV> > <DIV> </DIV> > <DIV>Does 2.6.16 from the kernel.org support this processor?</DIV> First of all, please avoid HTML in e-mail messages. It is hard to read, and normally banned on mailing list such as this one. Yes, MPC852T is supported, although I might add that I have been using 2.6.14 and 2.6.15 sucessfully with our own MPC852T-based board, but 2.6.16 did not boot and as of today I don't know why, or whether this is an issue at all with boards other than ours. > <DIV> </DIV> > <DIV>In the 2.6.16 sources I found support for CONFIG_8xx. Does this mean > that 852T processor is also supported?</DIV> <DIV> </DIV> Yes. Look at BSP stuff for other 8xx boards to learn how to port yours. Keep an eye on the new platform_bus stuff, that's currently being implemented for different drivers and subsystmes for powerpc (this could be the reason, our own BSP stuff stopped working with 2.6.16, btw). Also a transition from /arch/ppc and /arch/ppc64 towards the common /arch/powerpc is in progress, and therefore some things might be in a state of flux between released versions of the kernel. As of today (kernel 2.6.16) the architecture you need to use is still /arch/ppc. Good luck! Greetings, -- David Jander ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Linux 2.6 sources for MPC852T processor 2006-04-26 11:50 ` David Jander @ 2006-04-26 23:32 ` Dan Malek 2006-04-27 10:41 ` David Jander 2006-04-30 16:53 ` Marcelo Tosatti 0 siblings, 2 replies; 6+ messages in thread From: Dan Malek @ 2006-04-26 23:32 UTC (permalink / raw) To: David Jander; +Cc: linuxppc-embedded On Apr 26, 2006, at 7:50 AM, David Jander wrote: > Yes, MPC852T is supported, although I might add that I have been > using 2.6.14 > and 2.6.15 sucessfully with our own MPC852T-based board, but 2.6.16 > did not > boot and as of today I don't know why, or whether this is an issue > at all > with boards other than ours. There is a horrible bug in the 8xx TLB miss handler that is in the 2.6.16 sources. I don't know when it appeared. Enable the CPU6 Errata workaround to see if that solves the problem and please report back to me. I'm working on a solution. Thanks. -- Dan ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Linux 2.6 sources for MPC852T processor 2006-04-26 23:32 ` Dan Malek @ 2006-04-27 10:41 ` David Jander 2006-04-30 16:53 ` Marcelo Tosatti 1 sibling, 0 replies; 6+ messages in thread From: David Jander @ 2006-04-27 10:41 UTC (permalink / raw) To: Dan Malek; +Cc: chandrasekhar_n, linuxppc-embedded On Thursday 27 April 2006 01:32, Dan Malek wrote: > There is a horrible bug in the 8xx TLB miss handler that is in the > 2.6.16 > sources. I don't know when it appeared. Enable the CPU6 Errata > workaround to see if that solves the problem and please report back > to me. I'm working on a solution. I received instructions from Marcelo to reverse two patches he sent me this morning, that did solve the problem. In fact those patches changed some TLB-related assembly code in head_8xx.S Greetings, -- David Jander ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Linux 2.6 sources for MPC852T processor 2006-04-26 23:32 ` Dan Malek 2006-04-27 10:41 ` David Jander @ 2006-04-30 16:53 ` Marcelo Tosatti 2006-05-01 7:14 ` David Jander 1 sibling, 1 reply; 6+ messages in thread From: Marcelo Tosatti @ 2006-04-30 16:53 UTC (permalink / raw) To: Dan Malek; +Cc: David Jander, linuxppc-embedded On Wed, Apr 26, 2006 at 07:32:13PM -0400, Dan Malek wrote: > > On Apr 26, 2006, at 7:50 AM, David Jander wrote: > > > Yes, MPC852T is supported, although I might add that I have been > > using 2.6.14 > > and 2.6.15 sucessfully with our own MPC852T-based board, but 2.6.16 > > did not > > boot and as of today I don't know why, or whether this is an issue > > at all > > with boards other than ours. > > There is a horrible bug in the 8xx TLB miss handler that is in the > 2.6.16 > sources. I don't know when it appeared. Enable the CPU6 Errata > workaround to see if that solves the problem and please report back > to me. I'm working on a solution. Hi Dan, Shame on me! I screwed up. David, can you please try the following patch on top of vanilla v2.6.16? The large TLB change introduced in v2.6.16 (which is broken as is for configurations without CPU6 errata enabled as Dan noted) should boost performance significantly, so you might want to rerun the lmbench tests... diff --git a/arch/ppc/kernel/head_8xx.S b/arch/ppc/kernel/head_8xx.S index ec53c7d..7a2f205 100644 --- a/arch/ppc/kernel/head_8xx.S +++ b/arch/ppc/kernel/head_8xx.S @@ -355,9 +355,7 @@ #endif . = 0x1200 DataStoreTLBMiss: -#ifdef CONFIG_8xx_CPU6 stw r3, 8(r0) -#endif DO_8xx_CPU6(0x3f80, r3) mtspr SPRN_M_TW, r10 /* Save a couple of working registers */ mfcr r10 @@ -417,9 +415,7 @@ #endif lwz r11, 0(r0) mtcr r11 lwz r11, 4(r0) -#ifdef CONFIG_8xx_CPU6 lwz r3, 8(r0) -#endif rfi /* This is an instruction TLB error on the MPC8xx. This could be due ^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: Linux 2.6 sources for MPC852T processor 2006-04-30 16:53 ` Marcelo Tosatti @ 2006-05-01 7:14 ` David Jander 0 siblings, 0 replies; 6+ messages in thread From: David Jander @ 2006-05-01 7:14 UTC (permalink / raw) To: Marcelo Tosatti; +Cc: linuxppc-embedded Hi, I did the following: $ patch -p1 <tlbfix-mt.patch (This is the patch you sent me) $ cg-seek v2.6.16 Warning: uncommitted local changes, trying to bring them along patching file arch/ppc/8xx_io/Kconfig patching file arch/ppc/8xx_io/Makefile The next patch would create the file arch/ppc/8xx_io/cpm_spi.c, which already exists! Skipping patch. 1 out of 1 hunk ignored -- saving rejects to file arch/ppc/8xx_io/cpm_spi.c.rej patching file arch/ppc/Kconfig Hunk #2 succeeded at 927 (offset -16 lines). patching file arch/ppc/kernel/head_8xx.S patching file arch/ppc/platforms/Makefile Hunk #1 succeeded at 37 (offset -1 lines). The next patch would create the file arch/ppc/platforms/prtppc.h, which already exists! Skipping patch. 1 out of 1 hunk ignored -- saving rejects to file arch/ppc/platforms/prtppc.h.rej The next patch would create the file arch/ppc/platforms/prtppc_serial.h, which already exists! Skipping patch. 1 out of 1 hunk ignored -- saving rejects to file arch/ppc/platforms/prtppc_serial.h.rej The next patch would create the file arch/ppc/platforms/prtppc_setup.c, which already exists! Skipping patch. 1 out of 1 hunk ignored -- saving rejects to file arch/ppc/platforms/prtppc_setup.c.rej patching file arch/ppc/syslib/m8xx_setup.c patching file drivers/input/keyboard/Kconfig patching file drivers/input/keyboard/Makefile patching file drivers/usb/Kconfig patching file drivers/usb/host/isp116x.h patching file drivers/video/Kconfig patching file drivers/video/Makefile The next patch would create the file include/asm-ppc/cpm_spi.h, which already exists! Skipping patch. 1 out of 1 hunk ignored -- saving rejects to file include/asm-ppc/cpm_spi.h.rej patching file include/asm-ppc/mpc8xx.h patching file include/asm-ppc/ppc_sys.h patching file include/asm-ppc/serial.h Adding file arch/ppc/8xx_io/cpm_spi.c Adding file arch/ppc/platforms/prtppc.h Adding file arch/ppc/platforms/prtppc_serial.h Adding file arch/ppc/platforms/prtppc_setup.c Adding file include/asm-ppc/cpm_spi.h On commit 7705a8792b0fc82fd7d4dd923724606bbfd9fb20 All the abve is BSP stuff and drivers for our board, plus macrelo's patch. To verify, I did: $ cg-diff arch/ppc/kernel/head_8xx.S diff --git a/arch/ppc/kernel/head_8xx.S b/arch/ppc/kernel/head_8xx.S --- a/arch/ppc/kernel/head_8xx.S +++ b/arch/ppc/kernel/head_8xx.S @@ -357,9 +357,7 @@ InstructionTLBMiss: . = 0x1200 DataStoreTLBMiss: -#ifdef CONFIG_8xx_CPU6 stw r3, 8(r0) -#endif DO_8xx_CPU6(0x3f80, r3) mtspr SPRN_M_TW, r10 /* Save a couple of working registers */ mfcr r10 @@ -419,9 +417,7 @@ DataStoreTLBMiss: lwz r11, 0(r0) mtcr r11 lwz r11, 4(r0) -#ifdef CONFIG_8xx_CPU6 lwz r3, 8(r0) -#endif rfi /* This is an instruction TLB error on the MPC8xx. This could be due Looks good. $ make uImage Kernel doesn't boot, no output produced :-( Greetings, -- David Jander ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2006-05-01 7:11 UTC | newest] Thread overview: 6+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2006-04-26 9:50 Linux 2.6 sources for MPC852T processor Chandrasekhar Nagaraj 2006-04-26 11:50 ` David Jander 2006-04-26 23:32 ` Dan Malek 2006-04-27 10:41 ` David Jander 2006-04-30 16:53 ` Marcelo Tosatti 2006-05-01 7:14 ` David Jander
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