* Re: syscall adressing problem [not found] <200008101623.SAA11915@denx.local.net> @ 2000-08-16 9:57 ` Rene Pachernegg 2000-08-16 12:42 ` problems w/ CT69000 Topi Kanerva 0 siblings, 1 reply; 4+ messages in thread From: Rene Pachernegg @ 2000-08-16 9:57 UTC (permalink / raw) To: Wolfgang Denk, linuxppc-embedded Wolfgang Denk wrote: > In message <3992D331.21C3BD9C@apus.co.at> you wrote: > > > > Further searching leaded to the following: > > Sometimes fopen or open syscall work well > > Whenever they dont work they are call from the libc.so and the > > filename paramter adresses are 0x0fxxxxxx. > > I've seen very similar problems, but on MPC8xx system with more > current kernels. The reason was a change in arch/ppc/lib/string.S > which completely f*cked up the caches (ok - the MPC8xx have smalle > cache line sizes). > Thanks for the quick answer. My cache line size is the standard 32 byte. As I found in older messages from the mailing list, these string.S problems concern only unusual cache line sizes. Anyway I got the 2.2.6 and the 2.2.13 kernel sources and gave it a try --> no success. Then I tried to replace the copy_from_user in sys_open with my own read_through (flushes cache first, then reads memory) function. --> no success. Actually the strings to be passed to the syscall are readable from everywhere in user space, but in kernel space it reads just trash at the same adress. There are (just my opinion) only two possibilities: an adress translation problem in the kernel for adresses < 0x10000000 something is overwriting the memory space of the string - parameters for sys_open regards Rene > > Try (1) disabling caches; and (2) arch/ppc/lib/string.S from an older > (2.2.13) kernel version. > > It's just a guess, but maybe worth a try. > > Wolfgang Denk > > -- > Software Engineering: Embedded and Realtime Systems, Embedded Linux > Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd@denx.de > In an infinite universe all things are possible, including the possi- > bility that the universe does not exist. > - Terry Pratchett, _The Dark Side of the Sun_ ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/ ^ permalink raw reply [flat|nested] 4+ messages in thread
* problems w/ CT69000 2000-08-16 9:57 ` syscall adressing problem Rene Pachernegg @ 2000-08-16 12:42 ` Topi Kanerva 2000-08-16 14:21 ` Adrian Cox 2000-08-16 14:54 ` Small Web Server Jo-Ellen F. Mathews 0 siblings, 2 replies; 4+ messages in thread From: Topi Kanerva @ 2000-08-16 12:42 UTC (permalink / raw) Cc: linuxppc-embedded hello I'm addressing you folks at ppc-embedded because frankly, I don't know how to find any relevant info on this issue. We are developing a single-board solution with a CT69000 display controller. I built the XFree 4.0.1 on a development system (which also has a CT69000 on board, although its an intel platform...) and well, it doesn't work properly. There are visible artifacts (two vertical bars) at 24 bit pixel depth. Other modes (16bpp and 8bpp) work even less, thus being almost unusable. Can anyone point me in the right direction? How can I find out whether the problem is in the XFree86 chips.o driver or in the CT69000 chip / motherboard itself? I tried to find some kind of "errata" or other experiences, but the information on the CT69000 is very scarce, and since its mostly used for embedded development, I figured out that some of you might know what to do with this one or even experienced the same problem yourselves. BTW, is there any good FAQ on how to boot Linux kernel from DINK32? I haven't figured out any proper way to load blocks from a block device (e.g. an IDE hard disk) -topi ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/ ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: problems w/ CT69000 2000-08-16 12:42 ` problems w/ CT69000 Topi Kanerva @ 2000-08-16 14:21 ` Adrian Cox 2000-08-16 14:54 ` Small Web Server Jo-Ellen F. Mathews 1 sibling, 0 replies; 4+ messages in thread From: Adrian Cox @ 2000-08-16 14:21 UTC (permalink / raw) To: Topi Kanerva; +Cc: LinuxPPC-Embedded Topi Kanerva wrote: > I'm addressing you folks at ppc-embedded because frankly, I don't know how > to find any relevant info on this issue. We are developing a single-board > solution with a CT69000 display controller. Me too (well, a CT69030). I'm actually using a framebuffer driver for the chip, rather than the Xserver. If you're trying the chip on an Intel platfrom, a good first place to look is Thomas Hhenleitner's driver: www.visuelle-maschinen.de/ctfb/ctfb0.40.tgz I've been working on my own 69030 driver, and at some point hope to merge this with Thomas' driver, and possibly with the existing CT65554 driver in the kernel. - Adrian Cox, AG Electronics ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/ ^ permalink raw reply [flat|nested] 4+ messages in thread
* Small Web Server 2000-08-16 12:42 ` problems w/ CT69000 Topi Kanerva 2000-08-16 14:21 ` Adrian Cox @ 2000-08-16 14:54 ` Jo-Ellen F. Mathews 1 sibling, 0 replies; 4+ messages in thread From: Jo-Ellen F. Mathews @ 2000-08-16 14:54 UTC (permalink / raw) To: linuxppc-embedded Howdy Folks! I'm working on the RPX Lite, and I'm exploring my options for a small web server. I downloaded the "GoAhead" web server, and I'm testing it out on my host machine (Intel) first to become familiar with it and to see how large the binary is before giving it a try on the RPX. In the meantime, I'd thought I'd probe the list for suggested web servers that others may have tried on embedded boards and where to find such web servers. Any direction to good documentation would also be greatly appreciated. Thanks in advance! Jo-Ellen Mathews --------------------------------------------------------- Jo-Ellen F. Mathews AbsoluteValue Systems Web: http://www.linux-wlan.com P.O. Box 941149 e-mail: jo-ellen@linux-wlan.com Maitland, FL 32794-1149 Phone: 407.644.8582 USA Fax: 407.539.1294 ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/ ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2000-08-16 14:54 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
[not found] <200008101623.SAA11915@denx.local.net>
2000-08-16 9:57 ` syscall adressing problem Rene Pachernegg
2000-08-16 12:42 ` problems w/ CT69000 Topi Kanerva
2000-08-16 14:21 ` Adrian Cox
2000-08-16 14:54 ` Small Web Server Jo-Ellen F. Mathews
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for NNTP newsgroup(s).