Kyösti Mälkki (kyosti.malkki@gmail.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/896
-gerrit
commit 30317b7e8cf7fbf12c2449ff743616b2fab1f21f Author: Kyösti Mälkki kyosti.malkki@gmail.com Date: Wed Apr 18 19:47:56 2012 +0300
Intel e7505: refactor only
Drop comments (from e7501 era) which no longer seem to apply with e7505. Write the semi-constant D0:F0 table as code. Some register settings seem to be in different order compared with vendor BIOS, and will be handled by follow-up patches.
Split RCOMP register copy function in two parts. Drop some uses of inline and local_mdelay().
Change-Id: I8739d3b2bbad5861118e8b16ccea1dd86991204f Signed-off-by: Kyösti Mälkki kyosti.malkki@gmail.com --- src/northbridge/intel/e7505/raminit.c | 478 +++++++-------------------------- 1 files changed, 97 insertions(+), 381 deletions(-)
diff --git a/src/northbridge/intel/e7505/raminit.c b/src/northbridge/intel/e7505/raminit.c index e98a042..b06f81d 100644 --- a/src/northbridge/intel/e7505/raminit.c +++ b/src/northbridge/intel/e7505/raminit.c @@ -100,229 +100,38 @@ static const uint8_t dual_channel_parameters[] = { SPD_NUM_BANKS_PER_SDRAM };
- /* - * Table: constant_register_values - */ -static const long constant_register_values[] = { - /* SVID - Subsystem Vendor Identification Register - * 0x2c - 0x2d - * [15:00] Subsytem Vendor ID (Indicates system board vendor) + /* Comments here are remains of e7501 or even 855PM. + * They might be partially (in)correct for e7505. */ - /* SID - Subsystem Identification Register - * 0x2e - 0x2f - * [15:00] Subsystem ID - */ - // Not everyone wants to be Super Micro Computer, Inc. - // The mainboard should set this if desired. - // 0x2c, 0, (0x15d9 << 0) | (0x3580 << 16),
- /* Undocumented - * (DRAM Read Timing Control, if similar to 855PM?) - * 0x80 - 0x81 + /* (DRAM Read Timing Control, if similar to 855PM?) + * 0x80 - 0x81 documented differently for e7505 * This register has something to do with CAS latencies, * possibily this is the real chipset control. * At 0x00 CAS latency 1.5 works. * At 0x06 CAS latency 2.5 works. * At 0x01 CAS latency 2.0 works. - */ - /* This is still undocumented in e7501, but with different values + * + * This is still undocumented in e7501, but with different values * CAS 2.0 values taken from Intel BIOS settings, others are a guess * and may be terribly wrong. Old values preserved as comments until I * figure this out for sure. * e7501 docs claim that CAS1.5 is unsupported, so it may or may not * work at all. * Steven James 02/06/2003 - */ - /* NOTE: values now configured in configure_e7501_cas_latency() based + * + * NOTE: values now configured in configure_e7501_cas_latency() based * on SPD info and total number of DIMMs (per Intel) */
- /* FDHC - Fixed DRAM Hole Control - * 0x58 + /* FDHC - Fixed DRAM Hole Control ??? + * 0x58 undocumented for e7505, memory hole in southbridge configuration? * [7:7] Hole_Enable * 0 == No memory Hole * 1 == Memory Hole from 15MB to 16MB * [6:0] Reserved - * - * PAM - Programmable Attribute Map - * 0x59 [1:0] Reserved - * 0x59 [5:4] 0xF0000 - 0xFFFFF - * 0x5A [1:0] 0xC0000 - 0xC3FFF - * 0x5A [5:4] 0xC4000 - 0xC7FFF - * 0x5B [1:0] 0xC8000 - 0xCBFFF - * 0x5B [5:4] 0xCC000 - 0xCFFFF - * 0x5C [1:0] 0xD0000 - 0xD3FFF - * 0x5C [5:4] 0xD4000 - 0xD7FFF - * 0x5D [1:0] 0xD8000 - 0xDBFFF - * 0x5D [5:4] 0xDC000 - 0xDFFFF - * 0x5E [1:0] 0xE0000 - 0xE3FFF - * 0x5E [5:4] 0xE4000 - 0xE7FFF - * 0x5F [1:0] 0xE8000 - 0xEBFFF - * 0x5F [5:4] 0xEC000 - 0xEFFFF - * 00 == DRAM Disabled (All Access go to memory mapped I/O space) - * 01 == Read Only (Reads to DRAM, Writes to memory mapped I/O space) - * 10 == Write Only (Writes to DRAM, Reads to memory mapped I/O space) - * 11 == Normal (All Access go to DRAM) - */ - - // Map all legacy ranges to DRAM - 0x58, 0xcccccf7f, (0x00 << 0) | (0x30 << 8) | (0x33 << 16) | (0x33 << 24), - 0x5C, 0xcccccccc, (0x33 << 0) | (0x33 << 8) | (0x33 << 16) | (0x33 << 24), - - /* DRB - DRAM Row Boundary Registers - * 0x60 - 0x6F - * An array of 8 byte registers, which hold the ending - * memory address assigned to each pair of DIMMS, in 64MB - * granularity. - */ - // Conservatively say each row has 64MB of ram, we will fix this up later - // NOTE: These defaults allow us to prime all of the DIMMs on the board - // without jumping through 36-bit adddressing hoops, even if the - // total memory is > 4 GB. Changing these values may break do_ram_command()! - 0x60, 0x00000000, (0x01 << 0) | (0x02 << 8) | (0x03 << 16) | (0x04 << 24), -// 0x64, 0x00000000, (0x05 << 0) | (0x06 << 8) | (0x07 << 16) | (0x08 << 24), - 0x64, 0x00000000, (0x04 << 0) | (0x04 << 8) | (0x04 << 16) | (0x04 << 24), - - /* DRA - DRAM Row Attribute Register - * 0x70 Row 0,1 - * 0x71 Row 2,3 - * 0x72 Row 4,5 - * 0x73 Row 6,7 - * [7:7] Device width for Odd numbered rows - * 0 == 8 bits wide x8 - * 1 == 4 bits wide x4 - * [6:4] Row Attributes for Odd numbered rows - * 010 == 8KB (for dual-channel) - * 011 == 16KB (for dual-channel) - * 100 == 32KB (for dual-channel) - * 101 == 64KB (for dual-channel) - * Others == Reserved - * [3:3] Device width for Even numbered rows - * 0 == 8 bits wide x8 - * 1 == 4 bits wide x4 - * [2:0] Row Attributes for Even numbered rows - * 010 == 8KB (for dual-channel) - * 011 == 16KB (for dual-channel) - * 100 == 32KB (for dual-channel) - * 101 == 64KB (This page size appears broken) - * Others == Reserved - */ - // NOTE: overridden by configure_e7501_row_attributes(), later - 0x70, 0x00000000, 0, - - /* DRT - DRAM Timing Register - * 0x78 - * [31:30] Reserved - * [29:29] Back to Back Write-Read Turn Around - * 0 == 3 clocks between WR-RD commands - * 1 == 2 clocks between WR-RD commands - * [28:28] Back to Back Read-Write Turn Around - * 0 == 5 clocks between RD-WR commands - * 1 == 4 clocks between RD-WR commands - * [27:27] Back to Back Read Turn Around - * 0 == 4 clocks between RD commands - * 1 == 3 clocks between RD commands - * [26:24] Read Delay (tRD) - * 000 == 7 clocks - * 001 == 6 clocks - * 010 == 5 clocks - * Others == Reserved - * [23:19] Reserved - * [18:16] DRAM idle timer - * 000 == infinite - * 011 == 16 dram clocks - * 001 == 0 clocks - * [15:11] Reserved - * [10:09] Active to Precharge (tRAS) - * 00 == 7 clocks - * 01 == 6 clocks - * 10 == 5 clocks - * 11 == Reserved - * [08:06] Reserved - * [05:04] Cas Latency (tCL) - * 00 == 2.5 Clocks - * 01 == 2.0 Clocks - * 10 == Reserved (was 1.5 Clocks for E7500) - * 11 == Reserved - * [03:03] Write Ras# to Cas# Delay (tRCD) - * 0 == 3 DRAM Clocks - * 1 == 2 DRAM Clocks - * [02:01] Read RAS# to CAS# Delay (tRCD) - * 00 == reserved - * 01 == reserved - * 10 == 3 DRAM Clocks - * 11 == 2 DRAM Clocks - * [00:00] DRAM RAS# to Precharge (tRP) - * 0 == 3 DRAM Clocks - * 1 == 2 DRAM Clocks */
- // Some earlier settings: - /* Most aggressive settings possible */ -// 0x78, 0xc0fff8c4, (1<<29)|(1<<28)|(1<<27)|(2<<24)|(2<<9)|CAS_LATENCY|(1<<3)|(1<<1)|(1<<0), -// 0x78, 0xc0f8f8c0, (1<<29)|(1<<28)|(1<<27)|(1<<24)|(1<<16)|(2<<9)|CAS_LATENCY|(1<<3)|(3<<1)|(1<<0), -// 0x78, 0xc0f8f9c0, (1<<29)|(1<<28)|(1<<27)|(1<<24)|(1<<16)|(2<<9)|CAS_LATENCY|(1<<3)|(3<<1)|(1<<0), - - // The only things we need to set here are DRAM idle timer, Back-to-Back Read Turnaround, and - // Back-to-Back Write-Read Turnaround. All others are configured based on SPD. -// 0x78, 0xD7F8FFFF, (1 << 29) | (1 << 27) | (1 << 16), - 0x78, 0xC7F8FFFF, (0x03<<16)|(0x28<<24), - - /* FIXME why was I attempting to set a reserved bit? */ - /* 0x0100040f */ - - /* DRC - DRAM Contoller Mode Register - * 0x7c - * [31:30] Reserved - * [29:29] Initialization Complete - * 0 == Not Complete - * 1 == Complete - * [28:23] Reserved - * [22:22] Channels - * 0 == Single channel - * 1 == Dual Channel - * [21:20] DRAM Data Integrity Mode - * 00 == Disabled, no ECC - * 01 == Reserved - * 10 == Error checking, using chip-kill, with correction - * 11 == Reserved - * [19:18] DRB Granularity (Read-Only) - * 00 == 32 MB quantities (single channel mode) - * 01 == 64 MB quantities (dual-channel mode) - * 10 == Reserved - * 11 == Reserved - * [17:17] (Intel Undocumented) should always be set to 1 (SJM: comment inconsistent with current setting, below) - * [16:16] Command Per Clock - Address/Control Assertion Rule (CPC) - * 0 == 2n Rule - * 1 == 1n rule - * [15:11] Reserved - * [10:08] Refresh mode select - * 000 == Refresh disabled - * 001 == Refresh interval 15.6 usec - * 010 == Refresh interval 7.8 usec - * 011 == Refresh interval 64 usec - * 111 == Refresh every 64 clocks (fast refresh) - * [07:07] Reserved - * [06:04] Mode Select (SMS) - * 000 == Reserved (was Self Refresh Mode in E7500) - * 001 == NOP Command - * 010 == All Banks Precharge - * 011 == Mode Register Set - * 100 == Extended Mode Register Set - * 101 == Reserved - * 110 == CBR Refresh - * 111 == Normal Operation - * [03:00] Reserved - */ -// .long 0x7c, 0xffcefcff, (1<<22)|(2 << 20)|(1 << 16)| (0 << 8), -// .long 0x7c, 0xff8cfcff, (1<<22)|(2 << 20)|(1 << 17)|(1 << 16)| (0 << 8), -// .long 0x7c, 0xff80fcff, (1<<22)|(2 << 20)|(1 << 18)|(1 << 17)|(1 << 16)| (0 << 8), - - // Default to dual-channel mode, ECC, 1-clock address/cmd hold - // NOTE: configure_e7501_dram_controller_mode() configures further -// 0x7c, 0xff8ef8ff, (1 << 22) | (2 << 20) | (1 << 16) | (0 << 8), - 0x7c, 0xffcef8f7, 0x00210008, - /* Another Intel undocumented register * 0x88 - 0x8B * [31:31] Purpose unknown @@ -336,118 +145,8 @@ static const long constant_register_values[] = { * 0 == Normal operation? * 1 == Reset? */ - // NOTE: Some factory BIOSs don't do this. - // Doesn't seem to matter either way. - 0x88, 0xffffff00, 0x80, - - /* CLOCK_DIS - CK/CK# Disable Register - * 0x8C - * [7:7] DDR Frequency - * 0 == 100 MHz (200 MHz data rate) - * 1 == 133 MHz (266 MHz data rate) - * [6:4] Reserved - * [3:3] CK3 - * 0 == Enable - * 1 == Disable - * [2:2] CK2 - * 0 == Enable - * 1 == Disable - * [1:1] CK1 - * 0 == Enable - * 1 == Disable - * [0:0] CK0 - * 0 == Enable - * 1 == Disable - */ - // NOTE: Disable all clocks initially; turn ones we need back on - // in enable_e7501_clocks() - 0x8C, 0xfffffff0, 0xf, - - /* TOLM - Top of Low Memory Register - * 0xC4 - 0xC5 - * [15:11] Top of low memory (TOLM) - * The address below 4GB that should be treated as RAM, - * on a 128MB granularity. - * [10:00] Reserved - */ - /* REMAPBASE - Remap Base Address Regsiter - * 0xC6 - 0xC7 - * [15:10] Reserved - * [09:00] Remap Base Address [35:26] 64M aligned - * Bits [25:0] are assumed to be 0. - */ - - // NOTE: TOLM overridden by configure_e7501_ram_addresses() - 0xc4, 0xfc0007ff, (0x2000 << 0) | (0x3ff << 16), - - /* REMAPLIMIT - Remap Limit Address Register - * 0xC8 - 0xC9 - * [15:10] Reserved - * [09:00] Remap Limit Address [35:26] 64M aligned - * When remaplimit < remapbase the remap window is disabled. - */ - 0xc8, 0xfffffc00, 0, - - /* DVNP - Device Not Present Register - * 0xE0 - 0xE1 - * [15:05] Reserved - * [04:04] Device 4 Function 1 Present - * 0 == Present - * 1 == Absent - * [03:03] Device 3 Function 1 Present - * 0 == Present - * 1 == Absent - * [02:02] Device 2 Function 1 Present - * 0 == Present - * 1 == Absent - * [01:01] Reserved - * [00:00] Device 0 Function 1 Present - * 0 == Present - * 1 == Absent - */ - - // Enable D0:D1, disable D2:F1, D3:F1, D4:F1 -// 0xe0, 0xffffffe2, (1 << 4) | (1 << 3) | (1 << 2) | (0 << 0), - 0xe0, 0xfffffffa, 0x0, - - // Undocumented - 0xd8, 0xffff9fff, 0x00000000, - - // Undocumented - this is pure conjecture based on similarity to 855PM - /* MCHTST - MCH Test Register - * 0xF4 - 0xF7 - * [31:31] Purpose unknown - * [30:30] Purpose unknown - * [29:23] Unknown - not used? - * [22:22] System Memory MMR Enable - * 0 == Disable: mem space and BAR at 0x14 are not accessible - * 1 == Enable: mem space and BAR at 0x14 are accessible - * [21:20] Purpose unknown - * [19:02] Unknown - not used? - * [01:01] D6EN (Device #6 enable) - * 0 == Disable - * 1 == Enable - * [00:00] Unknown - not used? - */ - -// 0xf4, 0x3f8ffffd, 0x40300002, - -#ifdef SUSPICIOUS_LOOKING_CODE - // SJM: Undocumented. - // This will access D2:F0:0x50, is this correct?? - 0x1050, 0xffffffcf, 0x00000030, -#endif -}; - - /* DDR RECOMP tables */ -#if 0 -// Slew table for 1x drive? -static const uint32_t 1x_slew_table[] = { - 0x44332211, 0xc9776655, 0xffffffff, 0xffffffff, - 0x22111111, 0x55444332, 0xfffca876, 0xffffffff, -}; -#endif
+/* DDR RECOMP tables */ // Slew table for 2x drive? static const uint32_t slew_2x[] = { 0x00000000, 0x76543210, 0xffffeca8, 0xffffffff, @@ -466,21 +165,13 @@ Delay functions:
/* Estimate that SLOW_DOWN_IO takes about 1 us */ #define SLOW_DOWN_IO inb(0x80) -static inline void local_udelay(int i) +static void local_udelay(int i) { while (i--) { SLOW_DOWN_IO; } }
-static inline void local_mdelay(int i) -{ - i *= 1000; - while (i--) { - SLOW_DOWN_IO; - } -} - /* delay for 200us */ #define DO_DELAY local_udelay(200) #define EXTRA_DELAY DO_DELAY @@ -524,7 +215,7 @@ typedef enum { * 1 == Enable * [00:00] Unknown - not used? */ -static inline void mchtest_control(mchtst_cc cmd) +static void mchtest_control(mchtst_cc cmd) { uint32_t dword = pci_read_config32(MCHDEV, MCHTST); switch (cmd) { @@ -551,7 +242,7 @@ static inline void mchtest_control(mchtst_cc cmd) /** * */ -static inline void d060_control(d060_cc cmd) +static void d060_control(d060_cc cmd) { mchtest_control(D060_ENABLE); uint32_t dword = pci_read_config32(D060DEV, 0xf0); @@ -570,7 +261,7 @@ static inline void d060_control(d060_cc cmd) /** * */ -static inline void rcomp_smr_control(rcomp_smr_cc cmd) +static void rcomp_smr_control(rcomp_smr_cc cmd) { uint32_t dword = read32(RCOMP_MMIO + SMRCTL); switch (cmd) { @@ -995,6 +686,9 @@ static void do_ram_command(uint8_t command, uint16_t jedec_mode_bits)
dimm_start_64M_multiple = 0;
+ /* FIXME: Only address the number of rows present in the system? + * Seems like rows 4-7 overlap with 0-3. + */ for (i = 0; i < (MAX_NUM_CHANNELS * MAX_DIMM_SOCKETS_PER_CHANNEL); ++i) {
uint8_t dimm_end_64M_multiple = pci_read_config8(MCHDEV, DRB_ROW_0 + i); @@ -1003,7 +697,7 @@ static void do_ram_command(uint8_t command, uint16_t jedec_mode_bits) dimm_start_address &= 0x3ffffff; dimm_start_address |= dimm_start_64M_multiple << 26; read32(dimm_start_address); - // Set the start of the next DIMM + // Set the start of the next DIMM dimm_start_64M_multiple = dimm_end_64M_multiple; } } @@ -1756,47 +1450,6 @@ static void RAM_RESET_DDR_PTR(void) }
/** - * Set E7501 registers that are either independent of DIMM specifics, or - * establish default settings that will be overridden when we learn the - * specifics. - * - * This sets PCI configuration registers to known good values based on the - * table 'constant_register_values', which are a triple of configuration - * register offset, mask, and bits to set. - */ -static void ram_set_d0f0_regs(void) -{ - int i; - int num_values = ARRAY_SIZE(constant_register_values); - - ASSERT((num_values % 3) == 0); // Bad table? - - for (i = 0; i < num_values; i += 3) { - - uint32_t register_offset = constant_register_values[i]; - uint32_t bits_to_mask = constant_register_values[i + 1]; - uint32_t bits_to_set = constant_register_values[i + 2]; - uint32_t register_value; - - // It's theoretically possible to set values for something other than D0:F0, - // but it's not typically done here - ASSERT(!(register_offset & 0xFFFFFF00)); - - // bits_to_mask and bits_to_set should not reference the same bits - // Again, not strictly an error, but flagged as a potential bug - ASSERT((bits_to_mask & bits_to_set) == 0); - - register_value = - pci_read_config32(MCHDEV, register_offset); - register_value &= bits_to_mask; - register_value |= bits_to_set; - - pci_write_config32(MCHDEV, register_offset, - register_value); - } -} - -/** * Copy 64 bytes from one location to another. * * @param src_addr TODO @@ -1822,20 +1475,13 @@ static void write_8dwords(const uint32_t *src_addr, uint32_t dst_addr) * Comments below are conjecture based on apparent similarity between the * E7501 and these two chips. */ -static void ram_set_rcomp_regs(void) +static void rcomp_copy_registers(void) { uint32_t dword; - uint8_t strength_control, revision; + uint8_t strength_control;
RAM_DEBUG_MESSAGE("Setting RCOMP registers.\n");
- /* Set the RCOMP MMIO base address */ - mchtest_control(RCOMP_BAR_ENABLE); - pci_write_config32(MCHDEV, SMRBASE, RCOMP_MMIO); - - /* Block RCOMP updates while we configure the registers */ - rcomp_smr_control(RCOMP_HOLD); - /* Begin to write the RCOMP registers */ write8(RCOMP_MMIO + 0x2c, 0x0);
@@ -1902,7 +1548,6 @@ static void ram_set_rcomp_regs(void) write_8dwords(pull_updown_offset_table, RCOMP_MMIO + 0x1a0); write16(RCOMP_MMIO + 0x4e, 0);
- dword = read32(RCOMP_MMIO + 0x400); dword &= 0x7f7fffff; write32(RCOMP_MMIO + 0x400, dword); @@ -1910,18 +1555,27 @@ static void ram_set_rcomp_regs(void) dword = read32(RCOMP_MMIO + 0x408); dword &= 0x7f7fffff; write32(RCOMP_MMIO + 0x408, dword); +} + +static void ram_set_rcomp_regs(void) +{ + /* Set the RCOMP MMIO base address */ + mchtest_control(RCOMP_BAR_ENABLE); + pci_write_config32(MCHDEV, SMRBASE, RCOMP_MMIO);
+ /* Block RCOMP updates while we configure the registers */ + rcomp_smr_control(RCOMP_HOLD); + rcomp_copy_registers(); d060_control(D060_CMD_0); mchtest_control(MCHTST_CMD_0);
- revision = pci_read_config8(MCHDEV, 0x08); + uint8_t revision = pci_read_config8(MCHDEV, 0x08); if (revision >= 3) { rcomp_smr_control(RCOMP_SMR_00); rcomp_smr_control(RCOMP_SMR_01); } rcomp_smr_control(RCOMP_RELEASE);
- /* Wait 40 usec */ SLOW_DOWN_IO;
@@ -2084,11 +1738,73 @@ static void sdram_set_spd_registers(const struct mem_controller *ctrl) */ static void sdram_set_registers(const struct mem_controller *ctrl) { - RAM_DEBUG_MESSAGE("Northbridge prior to SDRAM init:\n"); - DUMPNORTH(); + uint32_t dword; + uint16_t word; + uint8_t byte;
ram_set_rcomp_regs(); - ram_set_d0f0_regs(); + + /* Enable 0:0.1, 0:2.1 */ + word = pci_read_config16(MCHDEV, DVNP); + word &= ~0x05; + pci_write_config16(MCHDEV, DVNP, word); + + /* Disable high-memory remap (power-on defaults, really) */ + pci_write_config16(MCHDEV, REMAPBASE, 0x03ff); + pci_write_config16(MCHDEV, REMAPLIMIT, 0x0); + + /* Disable legacy MMIO (0xC0000-0xEFFFF is DRAM) */ + int i; + pci_write_config8(MCHDEV, PAM_0, 0x30); + for (i=1; i<=6; i++) + pci_write_config8(MCHDEV, PAM_0 + i, 0x33); + + /* Conservatively say each row has 64MB of ram, we will fix this up later + * Initial TOLM 8 rows 64MB each (1<<3 * 1<<26) >> 16 = 1<<13 + * + * FIXME: Hard-coded limit to first four rows to prevent overlap! + */ + pci_write_config32(MCHDEV, DRB_ROW_0, 0x04030201); + pci_write_config32(MCHDEV, DRB_ROW_4, 0x04040404); + //pci_write_config32(MCHDEV, DRB_ROW_4, 0x08070605); + pci_write_config16(MCHDEV, TOLM, (1<<13)); + + /* DIMM clocks off */ + pci_write_config8(MCHDEV, CKDIS, 0xff); + + /* reset row attributes */ + pci_write_config32(MCHDEV, DRA, 0x0); + + // The only things we need to set here are DRAM idle timer, Back-to-Back Read Turnaround, and + // Back-to-Back Write-Read Turnaround. All others are configured based on SPD. + dword = pci_read_config32(MCHDEV, DRT); + dword &= 0xC7F8FFFF; + dword |= (0x28<<24)|(0x03<<16); + pci_write_config32(MCHDEV, DRT, dword); + + dword = pci_read_config32(MCHDEV, DRC); + dword &= 0xffcef8f7; + dword |= 0x00210008; + pci_write_config32(MCHDEV, DRC, dword); + + /* Undocumented */ + pci_write_config8(MCHDEV, 0x88, 0x80); + + /* Undocumented. Set much later in vendor BIOS. */ + byte = pci_read_config8(MCHDEV, 0xd9); + byte &= ~0x60; + pci_write_config8(MCHDEV, 0xd9, byte); + +#ifdef SUSPICIOUS_LOOKING_CODE + /* This will access D2:F0:0x50, is this correct?? + * Vendor BIOS reads Device ID before this is set. + * Undocumented in the p64h2 PCI-X bridge datasheet. + */ + byte = pci_read_config8(PCI_DEV(0,2,0), 0x50); + byte &= 0xcf; + byte |= 0x30 + pci_write_config8(PCI_DEV(0,2,0), 0x50, byte); +#endif
uint8_t revision = pci_read_config8(MCHDEV, 0x08); if (revision >= 3)