Pull bios_reader program from Xorg driver

Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

1 files changed, 680 insertions, 0 deletions

diff --git a/tools/intel_bios_reader.c b/tools/intel_bios_reader.c
new file mode 100644
index 00000000..6b79aec7
--- /dev/null
+++ b/tools/intel_bios_reader.c
@@ -0,0 +1,680 @@
+/*
+ * Copyright © 2006 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * Authors:
+ *    Eric Anholt <eric@anholt.net>
+ *
+ */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include "intel_bios.h"
+
+/* no bother to include "edid.h" */
+#define _H_ACTIVE(x) (x[2] + ((x[4] & 0xF0) << 4))
+#define _H_SYNC_OFF(x) (x[8] + ((x[11] & 0xC0) << 2))
+#define _H_SYNC_WIDTH(x) (x[9] + ((x[11] & 0x30) << 4))
+#define _H_BLANK(x) (x[3] + ((x[4] & 0x0F) << 8))
+#define _V_ACTIVE(x) (x[5] + ((x[7] & 0xF0) << 4))
+#define _V_SYNC_OFF(x) ((x[10] >> 4) + ((x[11] & 0x0C) << 2))
+#define _V_SYNC_WIDTH(x) ((x[10] & 0x0F) + ((x[11] & 0x03) << 4))
+#define _V_BLANK(x) (x[6] + ((x[7] & 0x0F) << 8))
+#define _PIXEL_CLOCK(x) (x[0] + (x[1] << 8)) * 10000
+
+/* Make a fake pI830 so we can easily pull i830_bios.c code in here. */
+struct _fake_i830 {
+	uint8_t *VBIOS;
+};
+struct _fake_i830 I830;
+struct _fake_i830 *pI830 = &I830;
+
+#define INTEL_BIOS_8(_addr)	(pI830->VBIOS[_addr])
+#define INTEL_BIOS_16(_addr)	(pI830->VBIOS[_addr] | \
+				 (pI830->VBIOS[_addr + 1] << 8))
+#define INTEL_BIOS_32(_addr)	(pI830->VBIOS[_addr] | \
+				 (pI830->VBIOS[_addr + 1] << 8) | \
+				 (pI830->VBIOS[_addr + 2] << 16) | \
+				 (pI830->VBIOS[_addr + 3] << 24))
+
+#define YESNO(val) ((val) ? "yes" : "no")
+
+struct bdb_block {
+	uint8_t id;
+	uint16_t size;
+	void *data;
+};
+
+struct bdb_header *bdb;
+static int tv_present;
+static int lvds_present;
+static int panel_type;
+
+static struct bdb_block *find_section(int section_id)
+{
+	struct bdb_block *block;
+	unsigned char *base = (unsigned char *)bdb;
+	int index = 0;
+	uint16_t total, current_size;
+	unsigned char current_id;
+
+	/* skip to first section */
+	index += bdb->header_size;
+	total = bdb->bdb_size;
+
+	block = malloc(sizeof(*block));
+	if (!block) {
+		fprintf(stderr, "out of memory\n");
+		exit(-1);
+	}
+
+	/* walk the sections looking for section_id */
+	while (index < total) {
+		current_id = *(base + index);
+		index++;
+		current_size = *((uint16_t *) (base + index));
+		index += 2;
+		if (current_id == section_id) {
+			block->id = current_id;
+			block->size = current_size;
+			block->data = base + index;
+			return block;
+		}
+		index += current_size;
+	}
+
+	free(block);
+	return NULL;
+}
+
+static void dump_general_features(void)
+{
+	struct bdb_general_features *features;
+	struct bdb_block *block;
+
+	block = find_section(BDB_GENERAL_FEATURES);
+
+	if (!block)
+		return;
+
+	features = block->data;
+
+	printf("General features block:\n");
+
+	printf("\tPanel fitting: ");
+	switch (features->panel_fitting) {
+	case 0:
+		printf("disabled\n");
+		break;
+	case 1:
+		printf("text only\n");
+		break;
+	case 2:
+		printf("graphics only\n");
+		break;
+	case 3:
+		printf("text & graphics\n");
+		break;
+	}
+	printf("\tFlexaim: %s\n", YESNO(features->flexaim));
+	printf("\tMessage: %s\n", YESNO(features->msg_enable));
+	printf("\tClear screen: %d\n", features->clear_screen);
+	printf("\tDVO color flip required: %s\n", YESNO(features->color_flip));
+	printf("\tExternal VBT: %s\n", YESNO(features->download_ext_vbt));
+	printf("\tEnable SSC: %s\n", YESNO(features->enable_ssc));
+	if (features->enable_ssc)
+		printf("\tSSC frequency: %s\n", features->ssc_freq ?
+		       "100 MHz (66 MHz on 855)" : "96 MHz (48 MHz on 855)");
+	printf("\tLFP on override: %s\n",
+	       YESNO(features->enable_lfp_on_override));
+	printf("\tDisable SSC on clone: %s\n",
+	       YESNO(features->disable_ssc_ddt));
+	printf("\tDisable smooth vision: %s\n",
+	       YESNO(features->disable_smooth_vision));
+	printf("\tSingle DVI for CRT/DVI: %s\n", YESNO(features->single_dvi));
+	printf("\tLegacy monitor detect: %s\n",
+	       YESNO(features->legacy_monitor_detect));
+	printf("\tIntegrated CRT: %s\n", YESNO(features->int_crt_support));
+	printf("\tIntegrated TV: %s\n", YESNO(features->int_tv_support));
+
+	tv_present = 1;		/* should be based on whether TV DAC exists */
+	lvds_present = 1;	/* should be based on IS_MOBILE() */
+
+	free(block);
+}
+
+static void dump_backlight_info(void)
+{
+	struct bdb_block *block;
+	struct bdb_lvds_backlight *backlight;
+	struct blc_struct *blc;
+
+	block = find_section(BDB_LVDS_BACKLIGHT);
+
+	if (!block)
+		return;
+
+	backlight = block->data;
+
+	printf("Backlight info block (len %d):\n", block->size);
+
+	if (sizeof(struct blc_struct) != backlight->blcstruct_size) {
+		printf("\tBacklight struct sizes don't match (expected %u, got %u), skipping\n",
+		     sizeof(struct blc_struct), backlight->blcstruct_size);
+		return;
+	}
+
+	blc = &backlight->panels[panel_type];
+
+	printf("\tInverter type: %d\n", blc->inverter_type);
+	printf("\t     polarity: %d\n", blc->inverter_polarity);
+	printf("\t    GPIO pins: %d\n", blc->gpio_pins);
+	printf("\t  GMBUS speed: %d\n", blc->gmbus_speed);
+	printf("\t     PWM freq: %d\n", blc->pwm_freq);
+	printf("\tMinimum brightness: %d\n", blc->min_brightness);
+	printf("\tI2C slave addr: 0x%02x\n", blc->i2c_slave_addr);
+	printf("\tI2C command: 0x%02x\n", blc->i2c_cmd);
+}
+
+static void dump_general_definitions(void)
+{
+	struct bdb_block *block;
+	struct bdb_general_definitions *defs;
+	struct child_device_config *child;
+	int i;
+	char child_id[11];
+	int child_device_num;
+
+	block = find_section(BDB_GENERAL_DEFINITIONS);
+
+	if (!block)
+		return;
+
+	defs = block->data;
+
+	printf("General definitions block:\n");
+
+	printf("\tCRT DDC GMBUS addr: 0x%02x\n", defs->crt_ddc_gmbus_pin);
+	printf("\tUse ACPI DPMS CRT power states: %s\n",
+	       YESNO(defs->dpms_acpi));
+	printf("\tSkip CRT detect at boot: %s\n",
+	       YESNO(defs->skip_boot_crt_detect));
+	printf("\tUse DPMS on AIM devices: %s\n", YESNO(defs->dpms_aim));
+	printf("\tBoot display type: 0x%02x%02x\n", defs->boot_display[1],
+	       defs->boot_display[0]);
+	printf("\tTV data block present: %s\n", YESNO(tv_present));
+	child_device_num = (block->size - sizeof(*defs)) / sizeof(*child);
+	for (i = 0; i < child_device_num; i++) {
+		child = &defs->devices[i];
+		if (!child->device_type) {
+			printf("\tChild device %d not present\n", i);
+			continue;
+		}
+		strncpy(child_id, (char *)child->device_id, 10);
+		child_id[10] = 0;
+		printf("\tChild %d device info:\n", i);
+		printf("\t\tSignature: %s\n", child_id);
+		printf("\t\tAIM offset: %d\n", child->addin_offset);
+		printf("\t\tDVO port: 0x%02x\n", child->dvo_port);
+	}
+
+	free(block);
+}
+
+#if 0
+static void dump_child_devices(void)
+{
+	struct bdb_block *block;
+	struct bdb_child_devices *child_devs;
+	struct child_device_config *child;
+	int i;
+
+	block = find_section(BDB_CHILD_DEVICE_TABLE);
+	if (!block) {
+		printf("No child device table found\n");
+		return;
+	}
+
+	child_devs = block->data;
+
+	printf("Child devices block:\n");
+	for (i = 0; i < DEVICE_CHILD_SIZE; i++) {
+		child = &child_devs->children[i];
+		/* Skip nonexistent children */
+		if (!child->device_type)
+			continue;
+		printf("\tChild device %d\n", i);
+		printf("\t\tType: 0x%04x\n", child->device_type);
+		printf("\t\tDVO port: 0x%02x\n", child->dvo_port);
+		printf("\t\tI2C pin: 0x%02x\n", child->i2c_pin);
+		printf("\t\tSlave addr: 0x%02x\n", child->slave_addr);
+		printf("\t\tDDC pin: 0x%02x\n", child->ddc_pin);
+		printf("\t\tDVO config: 0x%02x\n", child->dvo_cfg);
+		printf("\t\tDVO wiring: 0x%02x\n", child->dvo_wiring);
+	}
+
+	free(block);
+}
+#endif
+
+static void dump_lvds_options(void)
+{
+	struct bdb_block *block;
+	struct bdb_lvds_options *options;
+
+	block = find_section(BDB_LVDS_OPTIONS);
+	if (!block) {
+		printf("No LVDS options block\n");
+		return;
+	}
+
+	options = block->data;
+
+	printf("LVDS options block:\n");
+
+	panel_type = options->panel_type;
+	printf("\tPanel type: %d\n", panel_type);
+	printf("\tLVDS EDID available: %s\n", YESNO(options->lvds_edid));
+	printf("\tPixel dither: %s\n", YESNO(options->pixel_dither));
+	printf("\tPFIT auto ratio: %s\n", YESNO(options->pfit_ratio_auto));
+	printf("\tPFIT enhanced graphics mode: %s\n",
+	       YESNO(options->pfit_gfx_mode_enhanced));
+	printf("\tPFIT enhanced text mode: %s\n",
+	       YESNO(options->pfit_text_mode_enhanced));
+	printf("\tPFIT mode: %d\n", options->pfit_mode);
+
+	free(block);
+}
+
+static void dump_lvds_ptr_data(void)
+{
+	struct bdb_block *block;
+	struct bdb_lvds_lfp_data *lvds_data;
+	struct bdb_lvds_lfp_data_ptrs *ptrs;
+	struct lvds_fp_timing *fp_timing;
+	struct bdb_lvds_lfp_data_entry *entry;
+	int lfp_data_size;
+
+	block = find_section(BDB_LVDS_LFP_DATA_PTRS);
+	if (!block) {
+		printf("No LFP data pointers block\n");
+		return;
+	}
+	ptrs = block->data;
+
+	block = find_section(BDB_LVDS_LFP_DATA);
+	if (!block) {
+		printf("No LVDS data block\n");
+		return;
+	}
+	lvds_data = block->data;
+
+	lfp_data_size =
+	    ptrs->ptr[1].fp_timing_offset - ptrs->ptr[0].fp_timing_offset;
+	entry =
+	    (struct bdb_lvds_lfp_data_entry *)((uint8_t *) lvds_data->data +
+					       (lfp_data_size * panel_type));
+	fp_timing = &entry->fp_timing;
+
+	printf("LVDS timing pointer data:\n");
+	printf("  Number of entries: %d\n", ptrs->lvds_entries);
+
+	printf("\tpanel type %02i: %dx%d\n", panel_type, fp_timing->x_res,
+	       fp_timing->y_res);
+
+	free(block);
+}
+
+static void dump_lvds_data(void)
+{
+	struct bdb_block *block;
+	struct bdb_lvds_lfp_data *lvds_data;
+	struct bdb_lvds_lfp_data_ptrs *ptrs;
+	int num_entries;
+	int i;
+	int hdisplay, hsyncstart, hsyncend, htotal;
+	int vdisplay, vsyncstart, vsyncend, vtotal;
+	float clock;
+	int lfp_data_size, dvo_offset;
+
+	block = find_section(BDB_LVDS_LFP_DATA_PTRS);
+	if (!block) {
+		printf("No LVDS ptr block\n");
+		return;
+	}
+	ptrs = block->data;
+	lfp_data_size =
+	    ptrs->ptr[1].fp_timing_offset - ptrs->ptr[0].fp_timing_offset;
+	dvo_offset =
+	    ptrs->ptr[0].dvo_timing_offset - ptrs->ptr[0].fp_timing_offset;
+	free(block);
+
+	block = find_section(BDB_LVDS_LFP_DATA);
+	if (!block) {
+		printf("No LVDS data block\n");
+		return;
+	}
+
+	lvds_data = block->data;
+	num_entries = block->size / lfp_data_size;
+
+	printf("LVDS panel data block (preferred block marked with '*'):\n");
+	printf("  Number of entries: %d\n", num_entries);
+
+	for (i = 0; i < num_entries; i++) {
+		uint8_t *lfp_data_ptr =
+		    (uint8_t *) lvds_data->data + lfp_data_size * i;
+		uint8_t *timing_data = lfp_data_ptr + dvo_offset;
+		struct bdb_lvds_lfp_data_entry *lfp_data =
+		    (struct bdb_lvds_lfp_data_entry *)lfp_data_ptr;
+		char marker;
+
+		if (i == panel_type)
+			marker = '*';
+		else
+			marker = ' ';
+
+		hdisplay = _H_ACTIVE(timing_data);
+		hsyncstart = hdisplay + _H_SYNC_OFF(timing_data);
+		hsyncend = hsyncstart + _H_SYNC_WIDTH(timing_data);
+		htotal = hdisplay + _H_BLANK(timing_data);
+
+		vdisplay = _V_ACTIVE(timing_data);
+		vsyncstart = vdisplay + _V_SYNC_OFF(timing_data);
+		vsyncend = vsyncstart + _V_SYNC_WIDTH(timing_data);
+		vtotal = vdisplay + _V_BLANK(timing_data);
+		clock = _PIXEL_CLOCK(timing_data) / 1000;
+
+		printf("%c\tpanel type %02i: %dx%d clock %d\n", marker,
+		       i, lfp_data->fp_timing.x_res, lfp_data->fp_timing.y_res,
+		       _PIXEL_CLOCK(timing_data));
+		printf("\t\tinfo:\n");
+		printf("\t\t  LVDS: 0x%08lx\n",
+		       (unsigned long)lfp_data->fp_timing.lvds_reg_val);
+		printf("\t\t  PP_ON_DELAYS: 0x%08lx\n",
+		       (unsigned long)lfp_data->fp_timing.pp_on_reg_val);
+		printf("\t\t  PP_OFF_DELAYS: 0x%08lx\n",
+		       (unsigned long)lfp_data->fp_timing.pp_off_reg_val);
+		printf("\t\t  PP_DIVISOR: 0x%08lx\n",
+		       (unsigned long)lfp_data->fp_timing.pp_cycle_reg_val);
+		printf("\t\t  PFIT: 0x%08lx\n",
+		       (unsigned long)lfp_data->fp_timing.pfit_reg_val);
+		printf("\t\ttimings: %d %d %d %d %d %d %d %d %.2f (%s)\n",
+		       hdisplay, hsyncstart, hsyncend, htotal,
+		       vdisplay, vsyncstart, vsyncend, vtotal, clock,
+		       (hsyncend > htotal || vsyncend > vtotal) ?
+		       "BAD!" : "good");
+	}
+	free(block);
+}
+
+static void dump_driver_feature(void)
+{
+	struct bdb_block *block;
+	struct bdb_driver_feature *feature;
+
+	block = find_section(BDB_DRIVER_FEATURES);
+	if (!block) {
+		printf("No Driver feature data block\n");
+		return;
+	}
+	feature = block->data;
+
+	printf("Driver feature Data Block:\n");
+	printf("\tBoot Device Algorithm: %s\n", feature->boot_dev_algorithm ?
+	       "driver default" : "os default");
+	printf("\tBlock display switching when DVD active: %s\n",
+	       YESNO(feature->block_display_switch));
+	printf("\tAllow display switching when in Full Screen DOS: %s\n",
+	       YESNO(feature->allow_display_switch));
+	printf("\tHot Plug DVO: %s\n", YESNO(feature->hotplug_dvo));
+	printf("\tDual View Zoom: %s\n", YESNO(feature->dual_view_zoom));
+	printf("\tDriver INT 15h hook: %s\n", YESNO(feature->int15h_hook));
+	printf("\tEnable Sprite in Clone Mode: %s\n",
+	       YESNO(feature->sprite_in_clone));
+	printf("\tUse 00000110h ID for Primary LFP: %s\n",
+	       YESNO(feature->primary_lfp_id));
+	printf("\tBoot Mode X: %u\n", feature->boot_mode_x);
+	printf("\tBoot Mode Y: %u\n", feature->boot_mode_y);
+	printf("\tBoot Mode Bpp: %u\n", feature->boot_mode_bpp);
+	printf("\tBoot Mode Refresh: %u\n", feature->boot_mode_refresh);
+	printf("\tEnable LFP as primary: %s\n",
+	       YESNO(feature->enable_lfp_primary));
+	printf("\tSelective Mode Pruning: %s\n",
+	       YESNO(feature->selective_mode_pruning));
+	printf("\tDual-Frequency Graphics Technology: %s\n",
+	       YESNO(feature->dual_frequency));
+	printf("\tDefault Render Clock Frequency: %s\n",
+	       feature->render_clock_freq ? "low" : "high");
+	printf("\tNT 4.0 Dual Display Clone Support: %s\n",
+	       YESNO(feature->nt_clone_support));
+	printf("\tDefault Power Scheme user interface: %s\n",
+	       feature->power_scheme_ui ? "3rd party" : "CUI");
+	printf
+	    ("\tSprite Display Assignment when Overlay is Active in Clone Mode: %s\n",
+	     feature->sprite_display_assign ? "primary" : "secondary");
+	printf("\tDisplay Maintain Aspect Scaling via CUI: %s\n",
+	       YESNO(feature->cui_aspect_scaling));
+	printf("\tPreserve Aspect Ratio: %s\n",
+	       YESNO(feature->preserve_aspect_ratio));
+	printf("\tEnable SDVO device power down: %s\n",
+	       YESNO(feature->sdvo_device_power_down));
+	printf("\tCRT hotplug: %s\n", YESNO(feature->crt_hotplug));
+	printf("\tLVDS config: ");
+	switch (feature->lvds_config) {
+	case BDB_DRIVER_NO_LVDS:
+		printf("No LVDS\n");
+		break;
+	case BDB_DRIVER_INT_LVDS:
+		printf("Integrated LVDS\n");
+		break;
+	case BDB_DRIVER_SDVO_LVDS:
+		printf("SDVO LVDS\n");
+		break;
+	case BDB_DRIVER_EDP:
+		printf("Embedded DisplayPort\n");
+		break;
+	}
+	printf("\tDefine Display statically: %s\n",
+	       YESNO(feature->static_display));
+	printf("\tLegacy CRT max X: %d\n", feature->legacy_crt_max_x);
+	printf("\tLegacy CRT max Y: %d\n", feature->legacy_crt_max_y);
+	printf("\tLegacy CRT max refresh: %d\n",
+	       feature->legacy_crt_max_refresh);
+	free(block);
+}
+
+static void dump_edp(void)
+{
+	struct bdb_block *block;
+	struct bdb_edp *edp;
+	int bpp;
+
+	block = find_section(BDB_EDP);
+	if (!block) {
+		printf("No EDP data block\n");
+		return;
+	}
+	edp = block->data;
+
+	printf("eDP block: type %d\n", panel_type);
+	printf("\tPower Sequence: T3 %d T7 %d T9 %d T10 %d T12 %d\n",
+		edp->power_seqs[panel_type].t3,
+		edp->power_seqs[panel_type].t7,
+		edp->power_seqs[panel_type].t9,
+		edp->power_seqs[panel_type].t10,
+		edp->power_seqs[panel_type].t12);
+
+	bpp = (edp->color_depth >> (panel_type * 2)) & 3;
+
+	printf("\tPanel color depth: ");
+	switch (bpp) {
+	case EDP_18BPP:
+		printf("18bpp\n");
+		break;
+	case EDP_24BPP:
+		printf("24bpp\n");
+		break;
+	case EDP_30BPP:
+		printf("30bpp\n");
+		break;
+	}
+	printf("\teDP sDRRs MSA timing delay: %d\n", edp->sdrrs_msa_timing_delay);
+	printf("\tLink params:\n");
+	printf("\t\trate: ");
+	if (edp->link_params[panel_type].rate == EDP_RATE_1_62)
+		printf("1.62G\n");
+	else if (edp->link_params[panel_type].rate == EDP_RATE_2_7)
+		printf("2.7G\n");
+	printf("\t\tlanes: ");
+	switch (edp->link_params[panel_type].lanes) {
+	case EDP_LANE_1:
+		printf("x1 mode\n");
+		break;
+	case EDP_LANE_2:
+		printf("x2 mode\n");
+		break;
+	case EDP_LANE_4:
+		printf("x4 mode\n");
+		break;
+	}
+	printf("\t\tpre-emphasis: ");
+	switch (edp->link_params[panel_type].preemphasis) {
+	case EDP_PREEMPHASIS_NONE:
+		printf("none\n");
+		break;
+	case EDP_PREEMPHASIS_3_5dB:
+		printf("3.5dB\n");
+		break;
+	case EDP_PREEMPHASIS_6dB:
+		printf("6dB\n");
+		break;
+	case EDP_PREEMPHASIS_9_5dB:
+		printf("9.5dB\n");
+		break;
+	}
+	printf("\t\tvswing: ");
+	switch (edp->link_params[panel_type].vswing) {
+	case EDP_VSWING_0_4V:
+		printf("0.4V\n");
+		break;
+	case EDP_VSWING_0_6V:
+		printf("0.6V\n");
+		break;
+	case EDP_VSWING_0_8V:
+		printf("0.8V\n");
+		break;
+	case EDP_VSWING_1_2V:
+		printf("1.2V\n");
+		break;
+	}
+	free(block);
+}
+
+int main(int argc, char **argv)
+{
+	int fd;
+	struct vbt_header *vbt = NULL;
+	int vbt_off, bdb_off, i;
+	char *filename = "bios";
+	struct stat finfo;
+	struct bdb_block *block;
+	char signature[17];
+
+	if (argc != 2) {
+		printf("usage: %s <rom file>\n", argv[0]);
+		return 1;
+	}
+
+	filename = argv[1];
+
+	fd = open(filename, O_RDONLY);
+	if (fd == -1) {
+		printf("Couldn't open \"%s\": %s\n", filename, strerror(errno));
+		return 1;
+	}
+
+	if (stat(filename, &finfo)) {
+		printf("failed to stat \"%s\": %s\n", filename,
+		       strerror(errno));
+		return 1;
+	}
+
+	pI830->VBIOS = mmap(NULL, finfo.st_size, PROT_READ, MAP_SHARED, fd, 0);
+	if (pI830->VBIOS == MAP_FAILED) {
+		printf("failed to map \"%s\": %s\n", filename, strerror(errno));
+		return 1;
+	}
+
+	/* Scour memory looking for the VBT signature */
+	for (i = 0; i + 4 < finfo.st_size; i++) {
+		if (!memcmp(pI830->VBIOS + i, "$VBT", 4)) {
+			vbt_off = i;
+			vbt = (struct vbt_header *)(pI830->VBIOS + i);
+			break;
+		}
+	}
+
+	if (!vbt) {
+		printf("VBT signature missing\n");
+		return 1;
+	}
+
+	printf("VBT vers: %d.%d\n", vbt->version / 100, vbt->version % 100);
+
+	bdb_off = vbt_off + vbt->bdb_offset;
+	bdb = (struct bdb_header *)(pI830->VBIOS + bdb_off);
+	strncpy(signature, (char *)bdb->signature, 16);
+	signature[16] = 0;
+	printf("BDB sig: %s\n", signature);
+	printf("BDB vers: %d.%d\n", bdb->version / 100, bdb->version % 100);
+
+	printf("Available sections: ");
+	for (i = 0; i < 256; i++) {
+		block = find_section(i);
+		if (!block)
+			continue;
+		printf("%d ", i);
+		free(block);
+	}
+	printf("\n");
+
+	dump_general_features();
+	dump_general_definitions();
+//    dump_child_devices();
+	dump_lvds_options();
+	dump_lvds_data();
+	dump_lvds_ptr_data();
+	dump_backlight_info();
+
+	dump_driver_feature();
+	dump_edp();
+
+	return 0;
+}