coreboot July 2003

coreboot@coreboot.org

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150 discussions

EPIA Howto Update
by Mark Wilkinson 18 Jul '03

18 Jul '03

Hello All, Just a quick note to say that I've updated my EPIA howto to include a little section for the brave on enabling the onboard VGA. This is based on Sone Takeshi's work. Thanks to Andrew Ip for committing the update to CVS. Regards Mark.

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Re: EPIA-M DDR SPD detection [PMX:#]
by Dave Ashley 18 Jul '03

18 Jul '03

I'm not sure of anything, except that epia-m currently hardcodes the dram settings which isn't optimum. My approach was going to be A) Figure out how bloatware lm_sensors is reading the eeprom B) Understand the underlying mechanics C) Look for similiar functionality/implementation in linuxbios/northbridge D) Implement mechanism in epia-m to just hex dump the eeprom contents E) Pass the ball to someone else! -Dave >are you sure that the I2C is not being read now on EPIA-M? I have not >looked but it seems it ought to be. > >ron >

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Re: linuxbios + epia-m + vga success, here are details [PMX:#]
by Dave Ashley 18 Jul '03

18 Jul '03

Setting up a c-diff would be tricky on my end. The CVS checkout doesn't actually work as described in the linuxbios web page. I had to download the daily snapshot, then extract that into my own cvs server, then check that out to get the code. However I then started checking stuff back in since it was already setup...so what two trees can I diff now? Anyway all the relavent code was included in the email. You wouldn't want to change the MEMSIZE stuff, it is a different interrupt. You'd be mixing different things that should stay separate. I think how I've implemented it is the way to go. -Dave >oh! how embarrasing! > >This is good stuff, and you're implementing it just right. > >IF you want to send a c-diff for the int21 stuff I'll apply it. > >What I'll probably change is just have the INT21HANDLER call memsize() >which works on all platforms.

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Re: EPIA Howto Update
by Dave Ashley 18 Jul '03

18 Jul '03

How would C code work without the DRAM present? C requires a stack. I'd like to understand this if it is actually possible :^). I was thinking the CALLSP macro could be enhanced to some depth more than 1 using mmx registers as a stack. However maybe depth of 1 is plenty. -Dave >suggestion: next week the config tool should be basically done for >freebios2. You folks cold look at converting DRAM code to C and porting >the EPIA code to freebios2. It is about 100 times easier to code this >stuff up in C. > >ron > >_______________________________________________ >Linuxbios mailing list >Linuxbios(a)clustermatic.org >http://www.clustermatic.org/mailman/listinfo/linuxbios >

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Re: linuxbios + epia-m + vga success, here are details
by Dave Ashley 18 Jul '03

18 Jul '03

Just an update on progress. The X server crash was caused by our custom Xinput module not intializing a feedback device handler, SDL makes use of this probably related to joystick use. The call I needed to add is InitPtrFeedbackClassDeviceStruct however this is unrelated to linuxbios and was just a coincidence. I think I had gotten the problem before linuxbios but it didn't cause a seg fault of the X server for some reason. Who knows? The lm_sensors stuff wasn't working because the vt1211 superio device sensor machinery wasn't initialized or turned on. The stock bios initializes it but linuxbios doesn't. I added to epia-m's mainboard.c this table: static unsigned char vt1211hwmonitorinits[]={ 0x10,0x3, 0x11,0x10, 0x12,0xd, 0x13,0x7f, 0x14,0x21, 0x15,0x81, 0x16,0xbd, 0x17,0x8a, 0x18,0x0, 0x19,0x0, 0x1a,0x0, 0x1b,0x0, 0x1d,0xff, 0x1e,0x0, 0x1f,0x73, 0x20,0x67, 0x21,0xc1, 0x22,0xca, 0x23,0x74, 0x24,0xc2, 0x25,0xc7, 0x26,0xc9, 0x27,0x7f, 0x29,0x0, 0x2a,0x0, 0x2b,0xff, 0x2c,0x0, 0x2d,0xff, 0x2e,0x0, 0x2f,0xff, 0x30,0x0, 0x31,0xff, 0x32,0x0, 0x33,0xff, 0x34,0x0, 0x39,0xff, 0x3a,0x0, 0x3b,0xff, 0x3c,0xff, 0x3d,0xff, 0x3e,0x0, 0x3f,0xb0, 0x43,0xff, 0x44,0xff, 0x46,0xff, 0x47,0x50, 0x4a,0x3, 0x4b,0xc0, 0x4c,0x0, 0x4d,0x0, 0x4e,0xf, 0x5d,0x77, 0x5c,0x0, 0x5f,0x33, 0x40,0x1}; And inside mainboard_fixup() this function: // initialize vt1211 hardware monitor registers, which are at 0xECXX for(i=0;i<sizeof(vt1211hwmonitorinits);i+=2) outb(vt1211hwmonitorinits[i+1],0xec00+vt1211hwmonitorinits[i]); This seems to work. I also am using CMOS registers 0x80+ to store a bootrom version string. In our application we actually might prefer to remove the cmos battery. There was mention of the performance being 15% slow, this is real and was fixed by inplementing the bios callback for int 21 ax=0x5f18: Inside src/arch/i386/lib/idt.c case MEMSIZE: // who cares. eax = 64 * 1024; ret = 0; break; +#ifdef CONFIG_INT21HANDLER + case 0x15: + ret=handleint21( &edi, &esi, &ebp, &esp, + &ebx, &edx, &ecx, &eax, &flags); + break; +#endif default: printk_info(__FUNCTION__ ": Unsupport int #0x%x\n", intnumber); break; } Inside epia-m/mainboard.c again: int handleint21( unsigned long *edi, unsigned long *esi, unsigned long *ebp, unsigned long *esp, unsigned long *ebx, unsigned long *edx, unsigned long *ecx, unsigned long *eax, unsigned long *flags) { int res=-1; switch(*eax&0xffff) { case 0x5f19: break; case 0x5f18: *eax=0x5f; *ebx=0x15; // MCLK = 133, 32M frame buffer res=0; break; } return res; } --- And then inside the Config file: option CONFIG_INT21HANDLER=1 NOW: Everything appears fine except for these: 1) Serial port baud settings are not working correctly, something strange is happening. Probably some io device stepping on another. 2) DDR ram is hardcoded for some certain type of DDR module, instead of reading the SPD eeprom chip to determine the module configuration. I had at least 2 types of DDR modules, one of which doesn't work with the current setup. It has 8 chips labeled GET (128M total). The one that works has 16 chips labeled ICT (128M total also). -Dave >From linuxbios-admin(a)clustermatic.org Thu Jul 17 21:24:43 2003 >From: David Ashley <dash(a)xdr.com> >To: Linuxbios(a)clustermatic.org >Subject: linuxbios + epia-m + vga success, here are details >Now what do I have? > >I have some simple bios boot message appearing on startup, VIA CLE266 appears >as well as some other text in the upper left. The system boots and launched >XFree86 without problems. No frame buffer device, I'm using VIA's own XFree86 >drivers. Everything I've tested works, however a couple of applications using >SDL wig out the X server and cause it to seg fault, this should be easy to >track down. Also for some reasom the lm_sensors readings >cat /proc/sys/dev/sensors/vt1211-isa-ec00/temp* >are no longer valid, they seem frozen at some arbitrary values. >

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linuxbios + epia-m + vga success, here are details
by David Ashley 18 Jul '03

18 Jul '03

I included my epia-m contents when I pulled from the linuxbios cvs snapshot, then made some changes. My setup is we have a custom pci card in the slot of the epia-m that has an rtl8139 as well as some other parts. This causes some special problems. We want to boot of the pci card, not the internal via-rhine chip. The problem was that the other circuitry on the pci card was generating an interrupt, so when the board was soft reset there would be a lockup as soon as the rtl8139 interrupt became active--there was no driver present to ack the interrupt and make it go away. SO to fix that problem I made the epia-m reboot (see earlysetup.inc) once on startup. It uses CMOS ram byte 0x0e as a marker to tell whether we've already rebooted. In order to access CMOS this early in linuxbios the firewire device has to be moved out of the way, it defaults to answering PCI IO address 0000-, so the CMOS access ports 0x70-0x71 can't be seen. I don't know if my method here is strictly kosher but it seems to work so far. Incidentally there is a bug in the rtl8139.c driver of etherboot (and linux for that matter). The use of the IntrStatus register (word 0x3e) is incorrect. It is read only, any read clears all interrupts. The drivers behave as if they have to write 1 bits back to this register to explicitly clear interrupt request bits. This not the case. Careful reading of the rtl8139 data sheet explains how the register works. VGA system: There is a bit that has to be set in the device 0 function 0 pci registers to enable the VGA, as well as set its memory size. My setup is to hardcode it to 32 megs of ram. ADLO + Bochs are not used at all since we only want to boot into linux, no other legacy OS's. In another post on this newsgroup were instructions on how to get the pcbios features working to add a dummy bios as well as vga bios. In order to get the vga bios to write to 0xc0000 the shadow ram has to be enabled there. I extracted the VGA bios as described in the ADLO docs, doing the dd on /proc/kcore. I'm going Linuxbios -> etherboot 5.0.10 -> tftp linux The linux bootfile is produced with mkelfImage version 2.5, I'm using this command: /ram/mkelfImage-2.5/objdir/sbin/mkelfImage \ --command-line="root=/dev/ram console=ttyS0,115200 console=tty0" \ --kernel=/build/linux-via/arch/i386/boot/bzImage \ --ramdisk=/code/bootfiles/bootfiles/rd.gz \ --type=bzImage-i386 \ --output=bootfile_via_insecure Now what do I have? I have some simple bios boot message appearing on startup, VIA CLE266 appears as well as some other text in the upper left. The system boots and launched XFree86 without problems. No frame buffer device, I'm using VIA's own XFree86 drivers. Everything I've tested works, however a couple of applications using SDL wig out the X server and cause it to seg fault, this should be easy to track down. Also for some reasom the lm_sensors readings cat /proc/sys/dev/sensors/vt1211-isa-ec00/temp* are no longer valid, they seem frozen at some arbitrary values. Linuxbios logs lots of biosint messages, some of which are unsupported: biosint: # 0x15, eax 0x5f19 ebx 0x810 ecx 0x20 edx 0x3d4 biosint: ebp 0x11c30 esp 0xfca edi 0x44 esi 0xfffeb167 biosint: ip 0x4ef9 cs 0x44 flags 0x86 biosint: Unsupport int #0x15 biosint: # 0x15, eax 0x5f0f ebx 0x10 ecx 0x20 edx 0x3d5 biosint: ebp 0x11c30 esp 0xff0 edi 0x44 esi 0xfffe0000 biosint: ip 0x5c98 cs 0x0 flags 0x2 biosint: Unsupport int #0x15 biosint: # 0x15, eax 0x5f02 ebx 0x10 ecx 0x20 edx 0x3d4 biosint: ebp 0x11c30 esp 0xfde edi 0x44 esi 0xfffe0000 biosint: ip 0x4008 cs 0x0 flags 0x46 biosint: Unsupport int #0x15 biosint: # 0x15, eax 0x5f18 ebx 0x10 ecx 0x20 edx 0x3d4 biosint: ebp 0x10000 esp 0xff0 edi 0x44 esi 0xfffe0000 biosint: ip 0x5d7f cs 0x0 flags 0x86 In another email someone said these could be implemented, the VIA BIOS PORTING GUIDE describes what they need to do. That might relate to the crashing of XFree86. Performance seems to be perhaps 10-15% slower than under the stock bios, but that's not certain. I've attached a uuencoded copy of my epia-m directory contents from the freebios tree. I think that's all I've touched. 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MI+12/Y%#$+-F[%XK(F2AJ;M%LK,+1"E)]DB@^%RQQ2,8_E*4[X#<'FAI6(04 MUA9+R8Y=&BRM'"SA8%Z@LX=WB0Q(Y?421,*1B2Q_GBC"!T$0T--ECTJX^\MW M?8NJ/I\]8F%XB::%PMS;P"E!P)S;5!E4R![+AS>F[4WQ608K\M@CB'T+;_CB M(]Q/<+1R=>9HD_.=]YN<2HUML=$(D3XPO3"U`"]S;*R0&]6SH(CY"+2HBMO` MG!B>BW.M5`KIB[L<4G@8>0"ZR'[EVBPP/\5QV0O"\P(4<J?`V/S5&=ZV;=NV 6;=NV;=NV;=NV;5O6_@^\)V4(`%`````` ` end

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ADLO + EPIA-M + No hard disk, just etherboot/tftp?
by David Ashley 18 Jul '03

18 Jul '03

I'm working with the VIA EPIA-M motherboard. I'm trying to bring up ADLO with linuxbios, and I've gotten this far using tftp: Linuxbios -> etherboot-5.0.10 -> ADLO Previously I have had Linuxbios -> etherboot-5.0.10 -> linux, all ok except no VGA So I'm working on getting VGA up since although evidently people have done it they're not sharing. This is a diskless workstation so the idea is its root filesystem exists only over the network, and linux will always be booted with etherboot/bootp. However ADLO locks you into a hard drive boot. SO: Is it possible to merge the ADLO payload and my linux payload (made with mkelfImage-2.5) so that everything will work? Maybe I'd modify ADLO to just initialize itself then chain to the linux payload directly rather than try booting a hard drive. Any help appreciated. When/if successful I *will* share the procedure of getting VGA working with epia-m. Please cc me on replies since I'm not subscribed. Thanks-- Dave

2 1

Loading OS from Flash ROM.
by John Praveen 18 Jul '03

18 Jul '03

I am new to linux bios. My project is based on geode chip. I want my linux OS to be in Flash ROM(capacity 4 MB). I saw the HOW-TO for Sis based on DiskOnChip. What I have to modify and what other information i have to add if I want to boot from Flash ROM into SDRAM. Please help. Thanks. --------------------------------- Do you Yahoo!? SBC Yahoo! DSL - Now only $29.95 per month!

2 1

WTF
by David Ashley 18 Jul '03

18 Jul '03

I posted to the mailing list some important messages but they haven't appeared. What's the holdup? Is this moderation or censorship? -Dave

2 1

DoC 2000
by Thomas Wehrspann 18 Jul '03

18 Jul '03

Hello, I use successfully linuxbios with kernel and filesystem on a DoC Millenium - a describe in the Documantation - but the DoC 2000 is availeable in much greater size. Is it possible to replace the BIOS with a DoC 2000 istead of a Millenium? Or is there non special booting area? Thanks Thomas

2 1

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coreboot July 2003