SeaBIOS March 2014

seabios@seabios.org

10 participants
17 discussions

[PATCH v2] Update EFI_COMPATIBILITY16_TABLE to match 0.98 spec update
by David Woodhouse 02 Jun '14

02 Jun '14

We expect to use the space between the top of option ROMs and the bottom of our own BIOS code as a stack. OVMF was previously marking the whole region from 0xC0000 to 0xFFFFF read-only before invoking our Legacy16Boot method. Read-only stack considered harmful. Version 0.98 of the CSM spec adds the UmaAddress and UmaSize fields, which allow the CSM to specify a memory region that needs to be writable. There exists CONFIG_MALLOC_UPPERMEMORY which we could turn off to use the 9-segment, but that isn't particularly useful for the CSM case either because that memory isn't ours to play with until the final Legacy16Boot call. There's a LowPmmMemory given to use by UEFI to play with, but that's right in the *middle* of low memory and using that for persistent allocations would be painful. So just require CONFIG_MALLOC_UPPERMEMORY when building a CSM. Signed-off-by: David Woodhouse <David.Woodhouse(a)intel.com> --- v2: Require CONFIG_MALLOC_UPPERMEMORY. Default UmaAddress to &zonelow_base. src/Kconfig | 2 +- src/fw/csm.c | 6 +++++- src/std/LegacyBios.h | 20 ++++++++++++++++++++ 3 files changed, 26 insertions(+), 2 deletions(-) diff --git a/src/Kconfig b/src/Kconfig index a42ab2d..093075c 100644 --- a/src/Kconfig +++ b/src/Kconfig @@ -114,7 +114,7 @@ endchoice the BIOS in 16bit protected mode. config MALLOC_UPPERMEMORY - bool "Allocate memory that needs to be in first Meg above 0xc0000" + bool "Allocate memory that needs to be in first Meg above 0xc0000" if !CSM default y help Use the "Upper Memory Block" area (0xc0000-0xf0000) for diff --git a/src/fw/csm.c b/src/fw/csm.c index dfb0d12..4e4b688 100644 --- a/src/fw/csm.c +++ b/src/fw/csm.c @@ -34,6 +34,8 @@ EFI_COMPATIBILITY16_TABLE csm_compat_table VARFSEG __aligned(16) = { .Compatibility16CallOffset = 0 /* Filled in by checkrom.py */, .OemIdStringPointer = (u32)"SeaBIOS", .AcpiRsdPtrPointer = (u32)&csm_rsdp, + .UmaAddress = (u32)&zonelow_base, + .UmaSize = 0x10000, }; EFI_TO_COMPATIBILITY16_INIT_TABLE *csm_init_table; @@ -46,9 +48,11 @@ extern void __csm_return(struct bregs *regs) __noreturn; static void csm_return(struct bregs *regs) { - dprintf(3, "handle_csm returning AX=%04x\n", regs->ax); + u32 top = rom_get_max(); PICMask = pic_irqmask_read(); + csm_compat_table.UmaAddress = top; + csm_compat_table.UmaSize = 0xf0000 - top; __csm_return(regs); } diff --git a/src/std/LegacyBios.h b/src/std/LegacyBios.h index cf0c3c5..5170c37 100644 --- a/src/std/LegacyBios.h +++ b/src/std/LegacyBios.h @@ -228,6 +228,26 @@ typedef struct { /// Maximum PCI bus number assigned. /// UINT8 LastPciBus; + + /// + /// Start address of UMB RAM + /// + UINT32 UmaAddress; + + /// + /// Size of UMB RAM + /// + UINT32 UmaSize; + + /// + /// Start address of persistent allocation in high (>1MiB) memory + /// + UINT32 HiPermanentMemoryAddress; + + /// + /// Size of persistent allocation in high (>1MiB) memory + /// + UINT32 HiPermanentMemorySize; } EFI_COMPATIBILITY16_TABLE; /// -- 1.8.3.1 -- David Woodhouse Open Source Technology Centre David.Woodhouse(a)intel.com Intel Corporation

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[PATCH 0/3] Run pvscsi driver entirely in 32bit mode.
by Kevin O'Connor 30 May '14

30 May '14

As with the recent change to AHCI, if the pvscsi driver needs to jump into 32bit mode to access a register, then it's better to run the pvscsi driver entirely in 32bit mode. Evgeny, can you take a look at this and give it a test? Also, what command line do you use for testing? I tried testing locally by adding: -device pvscsi,id=pvscsi0 -device scsi-disk,bus=pvscsi0.0,drive=drive0 -drive id=drive0,if=none,file=dos-drivec-new to my qemu command line (both qemu v1.6 and qemu v1.7), but it doesn't work for me even before my changes. It hangs in pvscsi_wait_intr_cmpl(). -Kevin Kevin O'Connor (3): pvscsi: Don't store reference to struct pci_device. pvscsi: Always run entirely in 32bit mode. pvscsi: Remove use of LOWFLAT and GLOBALFLAT macros. Makefile | 4 +-- src/block.c | 8 +++-- src/hw/blockcmd.c | 3 +- src/hw/pvscsi.c | 106 +++++++++++++++++++++++++----------------------------- 4 files changed, 58 insertions(+), 63 deletions(-) -- 1.8.3.1

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[RFC PATCH] Add support for Intel Quark UART.
by David Woodhouse 28 May '14

28 May '14

This provides basic debug output on the Quark system, assuming that *something* (i.e. coreboot or UEFI) has set it up in advance for us. Signed-off-by: David Woodhouse <David.Woodhouse(a)intel.com> --- I looked briefly at making this part of the CONFIG_DEBUG_SERIAL code, and making that generic enough to handle I/O access *or* MMIO access depending on what's present... but in fact that's probably overkill. This isn't really limited to Quark; it would work with any 16550 device wired up as MMIO32. But we can expand it as required, I think. No point in starting off with the same functionality as the 5000-odd lines of the Linux kernel's 8250_pci.c. What do I need to do if called in 32-bit segmented mode? I'm guessing that's not going to work right now... src/Kconfig | 5 +++++ src/fw/csm.c | 2 ++ src/output.c | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 71 insertions(+) diff --git a/src/Kconfig b/src/Kconfig index a42ab2d..bdc2602 100644 --- a/src/Kconfig +++ b/src/Kconfig @@ -472,6 +472,11 @@ menu "Debugging" Set to zero to disable debugging. + config DEBUG_QUARK_UART + depends on DEBUG_LEVEL != 0 + bool "Debug to Quark UART #1" + default n + config DEBUG_SERIAL depends on DEBUG_LEVEL != 0 bool "Serial port debugging" diff --git a/src/fw/csm.c b/src/fw/csm.c index dfb0d12..afd7ffe 100644 --- a/src/fw/csm.c +++ b/src/fw/csm.c @@ -280,6 +280,8 @@ handle_csm(struct bregs *regs) if (!CONFIG_CSM) return; + debug_serial_preinit(); + dprintf(3, "handle_csm regs %p AX=%04x\n", regs, regs->ax); pic_irqmask_write(PICMask); diff --git a/src/output.c b/src/output.c index b47625f..a90d350 100644 --- a/src/output.c +++ b/src/output.c @@ -17,6 +17,8 @@ #include "stacks.h" // call16_int #include "string.h" // memset #include "util.h" // ScreenAndDebug +#include "hw/pci_regs.h" // PCI_VENDOR_ID, PCI_BASE_ADDRESS_0 +#include "hw/pci.h" // pci_config_readl struct putcinfo { void (*func)(struct putcinfo *info, char c); @@ -31,9 +33,59 @@ struct putcinfo { u16 DebugOutputPort VARFSEG = 0x402; +static volatile u32 *quark_uart_addr = 0; + +extern void _cfunc32flat_quark_uart_preinit(void); +extern void _cfunc32flat_quark_uart_putc(void); +extern void _cfunc32flat_quark_uart_flush(void); + +void quark_uart_preinit(void) +{ + // debug port is bus 0, device 0x14, function 5. + u16 uart_bdf = pci_to_bdf(0, 0x14, 5); + + // If it isn't a Quark UART... + if (pci_config_readl(uart_bdf, PCI_VENDOR_ID) != 0x09368086) + return; + + u32 bar0 = pci_config_readl(uart_bdf, PCI_BASE_ADDRESS_0); + if (!(bar0 & 0xf)) + quark_uart_addr = (void *)bar0; +} + +void quark_uart_putc(char c) +{ + if (!quark_uart_addr) + return; + + int timeout = DEBUG_TIMEOUT; + while ((quark_uart_addr[SEROFF_LSR] & 0x20) != 0x20) + if (!timeout--) + // Ran out of time. + return; + quark_uart_addr[SEROFF_DATA] = c; +} + +void quark_uart_flush(void) +{ + if (!quark_uart_addr) + return; + int timeout = DEBUG_TIMEOUT; + while ((quark_uart_addr[SEROFF_LSR] & 0x60) != 0x60) + if (!timeout--) + // Ran out of time. + return; +} + void debug_serial_preinit(void) { + if (CONFIG_DEBUG_QUARK_UART) { + if (MODE16) + call32(_cfunc32flat_quark_uart_preinit, 0, 0); + else + quark_uart_preinit(); + } if (!CONFIG_DEBUG_SERIAL) return; // setup for serial logging: 8N1 @@ -54,6 +106,12 @@ debug_serial_preinit(void) static void debug_serial(char c) { + if (CONFIG_DEBUG_QUARK_UART) { + if (MODE16) + call32(_cfunc32flat_quark_uart_putc, c, 0); + else + quark_uart_putc(c); + } if (!CONFIG_DEBUG_SERIAL) return; int timeout = DEBUG_TIMEOUT; @@ -68,6 +126,12 @@ debug_serial(char c) static void debug_serial_flush(void) { + if (CONFIG_DEBUG_QUARK_UART) { + if (MODE16) + call32(_cfunc32flat_quark_uart_flush, 0, 0); + else + quark_uart_flush(); + } if (!CONFIG_DEBUG_SERIAL) return; int timeout = DEBUG_TIMEOUT; -- 1.8.3.1 -- dwmw2

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E820 (Re: [v4 PATCH 00/12] SMBIOS: build full tables in QEMU)
by Gabriel L. Somlo 08 Apr '14

08 Apr '14

On Tue, Mar 18, 2014 at 07:23:17PM -0400, Gabriel L. Somlo wrote: > At this point, can anyone with access to a real, physical, NUMA > system dump the smbios tables with dmidecode and post them here? > I think that would be very informative. So I thrashed around a bit trying to find a real NUMA box, and found a Dell R410 whose BIOS claims to support NUMA by disabling the "Node Interleaving" option (haven't actually configured it to run NUMA, but based on what else I found, I no longer think I need to -- keep reading :) So, to my surprise, I noticed this machine did NOT have any Type 20 tables in SMBIOS at all !!! Then, after a more careful reading of the SMBIOS manual, I noticed that Type 20 was made OPTIONAL as v2.5 of the spec, cca. 2006 !!! In conclusion, we *could* simply scan e820 for E820_RAM type regions and generate Type 19 tables for each one we find, and we no longer have to care at all about generating Type 20 nodes to link 19s to 17s, which basically makes the problem go away, as far as I am concerned. I tested this (omitting Type 20) on OS X (10.6 through 10.9), XPsp3 and Win7, successfully, without either of them noticing any changes from previous executions where smbios tables were "different" (i.e., when they used to include T20). At this point, though, I'd like some feedback before I shoot out another version (v5) of this patch set: - Should I pretend we're generating v2.5 tables ? - this means Type 4 now has extra fields (i.e. the number of cores, etc), which should be relatively easy to add, so I'd be OK doing that, if we agree on everything else. Heck, how about going all out and implementing v2.8 ? That would get us past the 2T limit in Types 16, 17, and 19 ! - SeaBIOS is still in charge of providing the smbios_entry_point structure, and it's unlikely we can reasonably expect it to bump the version to 2.5 (not that it seems to matter, if my tests are to be believed) - on that note, SeaBIOS will still cheerfully generate Type 20 tables if nothing is supplied to it via fw_cfg from QEMU, and, again, I'm not sure how likely it is we can get it to stop doing that :) - Does anyone still care ? ;) Let me know what you all think! Thanks, --Gabriel

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Re: [SeaBIOS] Compiling SeaBios
by Kevin O'Connor 23 Mar '14

23 Mar '14

On Sun, Mar 23, 2014 at 12:04:32PM +0200, Michael S. Tsirkin wrote: > On Sat, Mar 22, 2014 at 07:35:53AM +0000, Jeff wrote: > > Hello, > > > > Can someone tells me if the compilation went well? I'm worried about: > > > > out/src/fw/ssdt-pcihp.dsl.i 45: Return (PCEJ(_SUN)) > > Warning 3104 - Reserved method should not return a value ^ (_EJ0) > > Yes, it's ok - it's a new warning produced by recent iasl versions in the ssdt. > We moved the ACPI to QEMU so the seabios versions isn't actively > maintained. > But it's easy to fix so maybe the below should be applied. > Or maybe it's better not to touch it ... If it's an obvious bug fix, it's probably better to fix it. Could you send to the mailing list? -Kevin > > > Note: lightly tested with a linux guest only. > > ---> > acpi: fix up iasl warning > > out/src/fw/ssdt-pcihp.dsl.i 45: Return (PCEJ(_SUN)) > Warning 3104 - Reserved method should not return a value ^ (_EJ0) > > Signed-off-by: Michael S. Tsirkin <mst(a)redhat.com> > > --- > > diff --git a/src/fw/ssdt-pcihp.dsl b/src/fw/ssdt-pcihp.dsl > index 67e485f..cb24c11 100644 > --- a/src/fw/ssdt-pcihp.dsl > +++ b/src/fw/ssdt-pcihp.dsl > @@ -29,7 +29,7 @@ DefinitionBlock ("ssdt-pcihp.aml", "SSDT", 0x01, "BXPC", "BXSSDTPCIHP", 0x1) > Name(_ADR, 0xAA0000) > ACPI_EXTRACT_METHOD_STRING ssdt_pcihp_ej0 > Method(_EJ0, 1) { > - Return (PCEJ(_SUN)) > + PCEJ(_SUN) > } > } > }

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Compiling SeaBios
by Jeff 22 Mar '14

22 Mar '14

Hello, Can someone tells me if the compilation went well? I'm worried about: out/src/fw/ssdt-pcihp.dsl.i 45: Return (PCEJ(_SUN)) Warning 3104 - Reserved method should not return a value ^ (_EJ0) Here is the full text: ----------------------------------------------------------- Script started on jeu. 20 mars 2014 19:55:29 UTC Build default config # # configuration written to /home/ubuntu/seabios1.7.4/.config # Build Kconfig config file Compile checking out/src/misc.o Compile checking out/src/stacks.o Compile checking out/src/output.o Compile checking out/src/string.o Compile checking out/src/x86.o Compile checking out/src/block.o Compile checking out/src/cdrom.o Compile checking out/src/mouse.o Compile checking out/src/kbd.o Compile checking out/src/serial.o Compile checking out/src/clock.o Compile checking out/src/resume.o Compile checking out/src/pnpbios.o Compile checking out/src/vgahooks.o Compile checking out/src/pcibios.o Compile checking out/src/apm.o Compile checking out/src/fw/smp.o Compile checking out/src/hw/pci.o Compile checking out/src/hw/timer.o Compile checking out/src/hw/rtc.o Compile checking out/src/hw/dma.o Compile checking out/src/hw/pic.o Compile checking out/src/hw/ps2port.o Compile checking out/src/hw/serialio.o Compile checking out/src/hw/usb.o Compile checking out/src/hw/usb-uhci.o Compile checking out/src/hw/usb-ohci.o Compile checking out/src/hw/usb-ehci.o Compile checking out/src/hw/usb-xhci.o Compile checking out/src/hw/usb-hid.o Compile checking out/src/hw/usb-msc.o Compile checking out/src/hw/usb-uas.o Compile checking out/src/hw/blockcmd.o Compile checking out/src/hw/floppy.o Compile checking out/src/hw/ata.o Compile checking out/src/hw/ramdisk.o Compile checking out/src/hw/virtio-ring.o Compile checking out/src/hw/virtio-pci.o Compile checking out/src/hw/virtio-blk.o Compile checking out/src/hw/virtio-scsi.o Compile checking out/src/hw/lsi-scsi.o Compile checking out/src/hw/esp-scsi.o Compile checking out/src/hw/megasas.o Compile checking out/src/hw/pvscsi.o Compile checking out/src/post.o Compile checking out/src/memmap.o Compile checking out/src/malloc.o Compile checking out/src/pmm.o Compile checking out/src/romfile.o Compile checking out/src/optionroms.o Compile checking out/src/boot.o Compile checking out/src/bootsplash.o Compile checking out/src/jpeg.o Compile checking out/src/bmp.o Compile checking out/src/hw/ahci.o Compile checking out/src/hw/usb-hub.o Compile checking out/src/fw/coreboot.o Compile checking out/src/fw/lzmadecode.o Compile checking out/src/fw/csm.o Compile checking out/src/fw/biostables.o Compile checking out/src/fw/paravirt.o Compile checking out/src/fw/shadow.o Compile checking out/src/fw/pciinit.o Compile checking out/src/fw/smm.o Compile checking out/src/fw/mtrr.o Compile checking out/src/fw/xen.o Compiling IASL out/src/fw/acpi-dsdt.hex ASL Input: out/src/fw/acpi-dsdt.dsl.i - 475 lines, 19178 bytes, 316 keywords AML Output: out/src/fw/acpi-dsdt.aml - 4407 bytes, 159 named objects, 157 executable opcodes Listing File: out/src/fw/acpi-dsdt.lst - 143267 bytes Hex Dump: out/src/fw/acpi-dsdt.hex - 41661 bytes Compilation complete. 0 Errors, 0 Warnings, 0 Remarks, 246 Optimizations Compiling IASL out/src/fw/ssdt-proc.hex ASL Input: out/src/fw/ssdt-proc.dsl.i - 35 lines, 762 bytes, 8 keywords AML Output: out/src/fw/ssdt-proc.aml - 120 bytes, 6 named objects, 2 executable opcodes Listing File: out/src/fw/ssdt-proc.lst - 2651 bytes Hex Dump: out/src/fw/ssdt-proc.hex - 1459 bytes Compilation complete. 0 Errors, 0 Warnings, 0 Remarks, 0 Optimizations Compiling IASL out/src/fw/ssdt-pcihp.hex out/src/fw/ssdt-pcihp.dsl.i 45: Return (PCEJ(_SUN)) Warning 3104 - Reserved method should not return a value ^ (_EJ0) ASL Input: out/src/fw/ssdt-pcihp.dsl.i - 51 lines, 782 bytes, 6 keywords AML Output: out/src/fw/ssdt-pcihp.aml - 88 bytes, 5 named objects, 1 executable opcodes Listing File: out/src/fw/ssdt-pcihp.lst - 2706 bytes Hex Dump: out/src/fw/ssdt-pcihp.hex - 1160 bytes Compilation complete. 0 Errors, 1 Warnings, 0 Remarks, 0 Optimizations Compiling IASL out/src/fw/ssdt-misc.hex ASL Input: out/src/fw/ssdt-misc.dsl.i - 127 lines, 2593 bytes, 35 keywords AML Output: out/src/fw/ssdt-misc.aml - 354 bytes, 24 named objects, 11 executable opcodes Listing File: out/src/fw/ssdt-misc.lst - 7656 bytes Hex Dump: out/src/fw/ssdt-misc.hex - 3710 bytes Compilation complete. 0 Errors, 0 Warnings, 0 Remarks, 2 Optimizations Compiling IASL out/src/fw/q35-acpi-dsdt.hex ASL Input: out/src/fw/q35-acpi-dsdt.dsl.i - 514 lines, 28284 bytes, 413 keywords AML Output: out/src/fw/q35-acpi-dsdt.aml - 7344 bytes, 239 named objects, 174 executable opcodes Listing File: out/src/fw/q35-acpi-dsdt.lst - 255960 bytes Hex Dump: out/src/fw/q35-acpi-dsdt.hex - 69190 bytes Compilation complete. 0 Errors, 0 Warnings, 0 Remarks, 445 Optimizations Compile checking out/src/fw/acpi.o Compile checking out/src/fw/mptable.o Compile checking out/src/fw/pirtable.o Compile checking out/src/fw/smbios.o Compile checking out/src/fw/romfile_loader.o Compiling whole program out/ccode32flat.o Compiling whole program out/code32seg.o Compile checking out/src/system.o Compile checking out/src/disk.o Compile checking out/src/font.o Compiling whole program out/ccode16.o Compiling to assembler out/src/asm-offsets.s Generating offset file out/asm-offsets.h Compiling (16bit) out/romlayout.o Building ld scripts Version: 1.7.4-20140320_195558-ubuntu Fixed space: 0xe05b-0x10000 total: 8101 slack: 13 Percent slack: 0.2% 16bit size: 38148 32bit segmented size: 1446 32bit flat size: 21376 32bit flat init size: 70784 Lowmem size: 2160 f-segment var size: 1750 Linking out/rom16.o Stripping out/rom16.strip.o Linking out/rom32seg.o Stripping out/rom32seg.strip.o Linking out/rom.o Prepping out/bios.bin.prep Total size: 138872 Fixed: 62728 Free: 123272 (used 53.0% of 256KiB rom) Creating out/bios.bin Script done on jeu. 20 mars 2014 19:55:59 UTC ------------------------------------------------------------------------------------------ Thanks a lot in advance. Jeff.

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[PATCH 1/2] init_virtio_blk, init_virtio_scsi: reset HBA on error
by Eric Northup 20 Mar '14

20 Mar '14

Extend commit 5f2d17d35b2339526f3b3d580b279ea78e406a25: reset on all error paths, and also for virtio_blk not just virtio_scsi. Signed-off-by: Eric Northup <digitaleric(a)google.com> --- src/hw/virtio-blk.c | 1 + src/hw/virtio-scsi.c | 5 ++--- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/src/hw/virtio-blk.c b/src/hw/virtio-blk.c index 7b22bf5..e2dbd3c 100644 --- a/src/hw/virtio-blk.c +++ b/src/hw/virtio-blk.c @@ -153,6 +153,7 @@ init_virtio_blk(struct pci_device *pci) return; fail: + vp_reset(ioaddr); free(vdrive->vq); free(vdrive); } diff --git a/src/hw/virtio-scsi.c b/src/hw/virtio-scsi.c index 48fb3e1..8f96687 100644 --- a/src/hw/virtio-scsi.c +++ b/src/hw/virtio-scsi.c @@ -158,14 +158,13 @@ init_virtio_scsi(struct pci_device *pci) for (tot = 0, i = 0; i < 256; i++) tot += virtio_scsi_scan_target(pci, ioaddr, vq, i); - if (!tot) { - vp_reset(ioaddr); + if (!tot) goto fail; - } return; fail: + vp_reset(ioaddr); free(vq); } -- 1.9.0.279.gdc9e3eb

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Re: [SeaBIOS] [PATCH] smbios: Default all values to zero.
by Kevin O'Connor 20 Mar '14

20 Mar '14

On Tue, Mar 11, 2014 at 11:49:29AM -0400, Kevin O'Connor wrote: > Make sure to initialize the entire smbios area to zero so that any > field not explicitly initialized does not have random values. (It was > found that the memory_error_information_handle field in smbios_type_17 > was not being set.) FYI, I have pushed this patch to the master repo. -Kevin

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Re: [SeaBIOS] [Qemu-devel] [ANNOUNCE] QEMU 2.0.0-rc0 is now available
by Andreas Färber 18 Mar '14

18 Mar '14

Hi, Am 14.03.2014 04:19, schrieb Anthony Liguori: > On behalf of the QEMU Team, I'd like to announce the availability of the > first release candidate for the QEMU 2.0 release. This release is meant > for testing purposes and should not be used in a production environment. > > http://wiki.qemu.org/download/qemu-2.0.0-rc0.tar.bz2 I've run into an issue with the SeaBIOS submodule included in the QEMU tarball: The SeaBIOS scripts/buildversion.sh script looks for a .git directory or file and, if absent, goes on to look for a .version file, neither of which the QEMU tarball ships. That means it will fall back to "?" as version, whereas the binary blob contributed by Gerd displays "rel-1.7.4-0-g96917a8". Should our tarball workflow include generating a roms/seabios/.version file based on git-describe in that directory to fix this mismatch? Thanks, Andreas -- SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer; HRB 16746 AG Nürnberg

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[PATCH] Ignore AHCI NPORTS
by Vladimir 'φ-coder/phcoder' Serbinenko 12 Mar '14

12 Mar '14

On Easynote LM85 under both coreboot and vendor BIOS NPORTS is 3, yet port 4 is used for CD-ROM. NPORTS is RO on this chipset and has same value on vendor BIOS as well, so it's not a coreboot bug. Linux does essentially the same, by increasing nports variable if bits in PI are set above nports-1. GRUB ignores PI since this problem was detected. diff --git a/src/hw/ahci.c b/src/hw/ahci.c index ff5d5f9..3193d81 100644 --- a/src/hw/ahci.c +++ b/src/hw/ahci.c @@ -601,7 +601,7 @@ ahci_controller_setup(struct pci_device *pci) dprintf(2, "AHCI: cap 0x%x, ports_impl 0x%x\n", ctrl->caps, ctrl->ports); - max = ctrl->caps & 0x1f; + max = 0x1f; for (pnr = 0; pnr <= max; pnr++) { if (!(ctrl->ports & (1 << pnr))) continue;

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SeaBIOS March 2014