August 2019 - SeaBIOS - mail.coreboot.org

[PATCH] advanced_bootmenu: up to 35 entries (2 pages if >18), numpad support (console)
by Mike Banon April 25, 2020

April 25, 2020

Add support for up to 35 boot menu entries (2 pages if >18). To solve the ">10" problem currently experienced by SeaBIOS users (there are no 11, 12, etc. keys on a keyboard - so impossible to choose the last menu entries if you got >10 entries because of multiple hard drives / secondary payloads / floppies) - the boot menu has been extended to the letter keys. NOTE: TPM menu has been moved from T to M letter: it is at the end of keyboard's 3rd row of letters and "Trusted" is adjective while "Module" is a noun; alternatively could press '-'. Also, add support for a numpad. Small USB numpad could be really convenient for choosing the boot entries at coreboot boards used as (maybe headless) servers. '/' char on numpad could be used to open the boot menu or to exit it. If there are >10 boot menu entries - the numpad console interface will be enabled: press one or two digit keys and then ENTER to confirm your choice, or remove a digit by pressing the '.Del' key. Also you could call TPM with '-' key at any moment, or boot with a single key press of your fullsize keyboard. Signed-off-by: Mike Banon <mikebdp2 at gmail.com> (patch body is after the testing instructions below) This "advanced_bootmenu" patch is much more useful when used together with my "multiple_floppies" patch: [SeaBIOS] [PATCH v2] ramdisk: search for all available floppy images instead of one https://mail.coreboot.org/pipermail/seabios/2018-December/012670.html Sadly I haven't done the suggestions by Kevin (I have so many unfinished tasks) so the "multiple_floppies" patch is also not merged yet. But you could install both patches to your coreboot by executing this script while at ./coreboot dir: https://pastebin.com/raw/hv9sSuMU And here is a coreboot image for QEMU with these two patches applied and my collection of wonderful and useful floppies added to popular the entries list: https://github.com/mikebdp2/floparchive/blob/master/coreboot.rom?raw=true Descriptions of the most prominent floppies could be found here: http://dangerousprototypes.com/docs/Lenovo_G505S_hacking#Useful_floppies Run this coreboot.rom by executing this QEMU command: (some floppies are 64-bit) qemu-system-x86_64 -L . -m 768 -localtime -vga vmware -net nic,model=rtl8139 \ -net user -soundhw ac97 -bios ./coreboot.rom -boot menu=on -serial stdio Best regards, Mike Banon diff --git a/src/boot.c b/src/boot.c index 9f82f3c..f94dd27 100644 --- a/src/boot.c +++ b/src/boot.c @@ -463,6 +463,7 @@ get_keystroke(int msec) * Boot menu and BCV execution ****************************************************************/ +#define BOOTMENU_PAGE_SIZE 18 #define DEFAULT_BOOTMENU_WAIT 2500 // Show IPL option menu. @@ -478,59 +479,282 @@ interactive_bootmenu(void) ; char *bootmsg = romfile_loadfile("etc/boot-menu-message", NULL); - int menukey = romfile_loadint("etc/boot-menu-key", 1); - printf("%s", bootmsg ?: "\nPress ESC for boot menu.\n\n"); + int menukey = romfile_loadint("etc/boot-menu-key", 1); // custom menukey + printf("%s", bootmsg ?: "\nPress ESC or \\ / slash for boot menu.\n\n"); free(bootmsg); u32 menutime = romfile_loadint("etc/boot-menu-wait", DEFAULT_BOOTMENU_WAIT); enable_bootsplash(); int scan_code = get_keystroke(menutime); disable_bootsplash(); - if (scan_code != menukey) + if (scan_code != menukey && // custom menukey + scan_code != 1 && // ESC + scan_code != 43 && // '\' char on keyboard + scan_code != 53 && // '/' char on keyboard + scan_code != 98) { // '/' char on numpad + if (scan_code == -1) + printf("No key pressed.\n"); + else + printf("Not a menukey pressed.\n"); return; + } while (get_keystroke(0) >= 0) ; - printf("Select boot device:\n\n"); wait_threads(); - // Show menu items + char keyboard_keys[35] = {'1','2','3','4','5','6','7','8','9','0', + 'q','w','e','r','t','y','u','i','o','p', + 'a','s','d','f','g','h','j','k','l', + 'z','x','c','v','b','n'}; /* m = TPM */ + int numpad_scancodes[10] = { 82, 79, 80, 81, 75, 76, 77, 71, 72, 73 }; + int numpi = 0; // Key index: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9. + int digits = 0; // Numerical length of a current choice number. + int decode = 0; // Decode the current choice number into a letter? + int entry_id = 0; + char desc[77]; + + printf("Select boot device"); + + // Show menu items after counting them and determining a number of pages. + // Only 35 boot menu items (36 if to count a TPM) are supported currently. + int maxmenu = 0; struct bootentry_s *pos; - hlist_for_each_entry(pos, &BootList, node) { - char desc[77]; + hlist_for_each_entry(pos, &BootList, node) maxmenu++; - printf("%d. %s\n", maxmenu + + if (maxmenu > 10) { + if (maxmenu > 35) + maxmenu = 35; + if (maxmenu > BOOTMENU_PAGE_SIZE) + printf(" - page 1 :"); + else + printf(": "); + printf(" // press ENTER after your numpad input"); + if (maxmenu > BOOTMENU_PAGE_SIZE) + printf(" - if any -\n " + " // - or to switch between the pages...\n"); + else + printf(" (if any)\n\n"); + } else { + printf(":\n\n"); + } + + hlist_for_each_entry(pos, &BootList, node) { + if (entry_id == BOOTMENU_PAGE_SIZE) // Show only the first page. + break; + printf("%c. %s\n", keyboard_keys[entry_id] , strtcpy(desc, pos->description, ARRAY_SIZE(desc))); + entry_id++; } + int tpm_cshm = 0; if (tpm_can_show_menu()) { - printf("\nt. TPM Configuration\n"); + tpm_cshm = 1; + printf("\nm-. TPM Configuration"); } - - // Get key press. If the menu key is ESC, do not restart boot unless - // 1.5 seconds have passed. Otherwise users (trained by years of - // repeatedly hitting keys to enter the BIOS) will end up hitting ESC - // multiple times and immediately booting the primary boot device. - int esc_accepted_time = irqtimer_calc(menukey == 1 ? 1500 : 0); + printf("\n> "); + + // Do not restart boot on menukey press, unless DEFAULT_BOOTMENU_WAIT msecs + // have passed. Otherwise users (trained by years of repeatedly hitting keys + // to enter the BIOS) will end up hitting menukey multiple times and + // immediately booting the primary boot device. + int esc_accepted_time = irqtimer_calc(DEFAULT_BOOTMENU_WAIT); + int choice = 0, kb_choice = 0; + int page_num = 1; + int enter = 0; + int backspace = 0; + int tpm_show_menu = 0; for (;;) { scan_code = get_keystroke(1000); - if (scan_code == 1 && !irqtimer_check(esc_accepted_time)) - continue; - if (tpm_can_show_menu() && scan_code == 20 /* t */) { + if (scan_code == menukey || // custom menukey + scan_code == 1 || // ESC + scan_code == 43 || // '\' char on keyboard + scan_code == 53 || // '/' char on keyboard + scan_code == 98) { // '/' char on numpad + if (!irqtimer_check(esc_accepted_time)) + continue; + if (digits == 2) // Remove the decoded "(*)" + printf(" \b\b\b"); + /* Remove the existing input before printing a message. */ + for (; digits > 0; digits--) + printf("\b \b"); + printf("Menukey pressed.\n"); + return; + } + kb_choice = 0; + /* 4 rows of keyboard_keys: 1 row with numbers, 3 rows with letters. + Use any of them to select a boot device (except the TPM 'm-' keys) */ + // 1st range: 1-9 and 0 (10) keys <==> 2-11 scan codes <==> 1-10 choice + if (scan_code >= 2 && scan_code <= 11) kb_choice = scan_code - 1; + // 2nd range: Q-P row of letters <==> 16-25 scan codes <==> 11-20 choice + if (scan_code >= 16 && scan_code <= 25) kb_choice = scan_code - 5; + // 3rd range: A-L row of letters <==> 30-38 scan codes <==> 21-29 choice + if (scan_code >= 30 && scan_code <= 38) kb_choice = scan_code - 9; + // 4th range: Z-N row of letters <==> 44-49 scan codes <==> 30-35 choice + if (scan_code >= 44 && scan_code <= 49) kb_choice = scan_code - 14; + // ENTER: (28) on keyboard, (96) on numpad. + if (scan_code == 28 || scan_code == 96) + enter = 1; + // BCKSPC: '<-'(14) and 'Delete'(111) on keyboard, '.Del'(83) on numpad. + if (scan_code == 14 || scan_code == 111 || scan_code == 83) + backspace = 1; + // TPM keys: 'm'(50) and '-'(12) chars on keyboard, '-'(74) on numpad. + if ((scan_code == 50 || scan_code == 12 || scan_code == 74) && tpm_cshm) + tpm_show_menu = 1; + + if (kb_choice != 0 || tpm_show_menu) { + if (kb_choice > maxmenu) { + if (!tpm_show_menu) + continue; + } else { + choice = kb_choice; + } + if (digits == 2) // Remove the decoded "(*)" + printf(" \b\b\b"); + /* Remove the existing input before printing a choice. */ + for (; digits > 0; digits--) + printf("\b \b"); + if (!tpm_show_menu) { + // Choice is any of the detected boot devices ==> lets boot! + break; + } + } else { + // Internal/USB Numpad console interface. + if (digits < 9) { + for (numpi = 0; numpi < 10; numpi++) { + if (scan_code == numpad_scancodes[numpi]) { + if (maxmenu <= 10) { // Console interface is not needed. + if ((numpi != 0 && numpi <= maxmenu) || + (numpi == 0 && 10 <= maxmenu)) { // 10(0) + choice = numpi; + enter = 1; // Fake ENTER to boot this entry now. + } else { // If no such an entry, don't try to boot. + break; + } + } else { + if (digits == 2) { + printf(" \b\b\b"); // Remove the decoded "(*)" + if (choice == 0) { + printf("\b\b \b\b"); // Remove "10". + digits = 0; + } + } + choice = 10 * choice + numpi; + } + if (choice > 0) { + printf("%d", numpi); // Print the entered digit. + digits++; + } else { + if (10 <= maxmenu) + printf("10(0)\b\b\b"); + else + printf("10(?)\b\b\b"); + digits = 2; + } + if (choice > 9 && digits == 2) // Decode into a letter. + decode = 1; + break; + } + } + } + if (backspace && digits > 0) { + backspace = 0; + choice = choice / 10; + if (digits == 2) { + printf(" \b\b\b"); // Remove the decoded "(*)" + // 0 turned into 10: one more Backspace is needed to remove. + if (choice == 0) { + printf("\b \b"); + digits--; + } + } + printf("\b \b"); // Remove the last entered digit. + digits--; + if (choice > 9 && digits == 2) // Decode into a letter. + decode = 1; + } + if (decode) { // Decode the current choice number into a letter. + decode = 0; + if (choice <= maxmenu) { + printf("(%c)", keyboard_keys[choice-1]); + } else { + if (tpm_cshm && choice == 36) + printf("(m)"); // For TPM. + else + printf("(?)"); // No matching letter found. + } + printf("\b\b\b"); // Move a cursor before the "(*)" + } + } + + if (enter) { + enter = 0; + if (choice == 0) { + if (digits == 2) { // for 0 that turned into 10 + if (10 <= maxmenu) + break; + else + continue; + } + // If there are two pages - switch between them. + if (maxmenu > BOOTMENU_PAGE_SIZE) { + entry_id = 0; + page_num = 3 - page_num; // 3 - 1 = 2; 3 - 2 = 1. + printf("\n\nSelect boot device - page %d :" + " // press ENTER after your numpad input" + " - if any -\n " + " // - or to switch between the pages...\n", + page_num); + hlist_for_each_entry(pos, &BootList, node) { + if ((page_num == 1 && entry_id == BOOTMENU_PAGE_SIZE) || + (page_num == 2 && entry_id == 35)) + break; + if (page_num == 1 || entry_id >= BOOTMENU_PAGE_SIZE) + printf("%c. %s\n", keyboard_keys[entry_id], + strtcpy(desc, pos->description, ARRAY_SIZE(desc))); + entry_id++; + } + if (tpm_cshm) + printf("\nm-. TPM Configuration"); + printf("\n> "); + } + } else { + if (choice > maxmenu) { + if (tpm_cshm && choice == 36) + tpm_show_menu = 1; + } else { + // Choice is any of the detected boot devices ==> lets boot! + break; + } + } + } + + if (tpm_show_menu) { + tpm_show_menu = 0; + choice = 0; + if (digits == 0) + printf("TPM key pressed."); + else + digits = 0; printf("\n"); tpm_menu(); + printf("> "); } - if (scan_code >= 1 && scan_code <= maxmenu+1) - break; + } + + if (choice == 0) // 10(0) + choice = 10; + + if (digits == 0 && choice < 36) { + printf("%c", keyboard_keys[choice-1]); + if (choice > 9) // Decode into a number. + printf("(%d)", choice); } printf("\n"); - if (scan_code == 0x01) - // ESC - return; // Find entry and make top priority. - int choice = scan_code - 1; hlist_for_each_entry(pos, &BootList, node) { if (! --choice) break; diff --git a/src/config.h b/src/config.h index 93c8dbc..f85cc14 100644 --- a/src/config.h +++ b/src/config.h @@ -19,7 +19,7 @@ // Space to reserve in high-memory for tables #define BUILD_MAX_HIGHTABLE (256*1024) // Largest supported externaly facing drive id -#define BUILD_MAX_EXTDRIVE 16 +#define BUILD_MAX_EXTDRIVE 36 // Number of bytes the smbios may be and still live in the f-segment #define BUILD_MAX_SMBIOS_FSEG 600 // Maximum number of bytes the mptable may be and still be copied to f-segment

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Custom-sized, large floppy images?
by Rafael Send April 4, 2020

April 4, 2020

Hi, I'm working on stuffing a bootable Linux distro into coreboot. In QEMU I already succeded by using coreboot's built-in kernel loading mechanism, but that's without SeaBIOS. I'd love to have it as a SeaBIOS payload so I can also boot other things, but I guess I'd have to create a custom-sized floppy image for this or figure out how to create an ELF payload out of a Linux kernel (I'm open to either, but I wasn't able to find any documentation on the ELF method). The guy who put Win 3.1 in coreboot attempted the floppy method, but according to his article he did not find success with this method due to unknown and complex issues in the floppy-side logic of SeaBIOS. So, I'm making the question explicit: What would it take to support custom-sized floppy images? In particular, I'm thinking of a 16MB device... Alternatively, would it be possible to create an ELF file out of a Linux kernel+initrd / bootable image? Cheers, Rafael

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Booting Memtest86+ from CBFS fails
by Martin Kepplinger Nov. 8, 2019

Nov. 8, 2019

Hi, I use the simple coreboot config https://github.com/merge/skulls/blob/master/x230/free-defconfig-555419f356 on today's coreboot master branch HEAD (403f433238), using SeaBIOS 1.12.1. When choosing memtest86+ in SeaBIOS' menu, "Booting from CBFS" gets printed but nothing else happens. Booting into nvramcui or coreinfo works though. (earlier, at least on coreboot 555419f356, using the same version of SeaBIOS, things were fine). Can you imagine why? thanks, martin

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[PATCH v3 0/2] Add additional resolutions for 16:9 displays: 1600x900 and 2560x1440
by Uwe Kleine-König Oct. 17, 2019

Oct. 17, 2019

Hello, this is my attempt to address the review comments I got for v2: - Gerd pointed out that cbvesa should only use the modes where memmodel == MM_DIRECT. - Kevin noted that reading global variables need the GET_GLOBAL wrapper. (I would have expected that the compiler does the right thing here. Probably I'm still to wet behind the ears here :-) Note this is only compile tested. Uwe Kleine-König (2): cbvga: reuse svga modes definitions from svgamodes.c Add additional resolutions for 16:9 displays: 1600x900 and 2560x1440 vgasrc/cbvga.c | 80 ++++++---------------------------------------- vgasrc/svgamodes.c | 8 +++++ 2 files changed, 17 insertions(+), 71 deletions(-) -- 2.20.1

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[PATCH v6 0/8] Add Qemu to SeaBIOS LCHS interface
by Sam Eiderman Sept. 23, 2019

Sept. 23, 2019

v1: Non-standard logical geometries break under QEMU. A virtual disk which contains an operating system which depends on logical geometries (consistent values being reported from BIOS INT13 AH=08) will most likely break under QEMU/SeaBIOS if it has non-standard logical geometries - for example 56 SPT (sectors per track). No matter what QEMU will guess - SeaBIOS, for large enough disks - will use LBA translation, which will report 63 SPT instead. In addition we can not enforce SeaBIOS to rely on phyiscal geometries at all. A virtio-blk-pci virtual disk with 255 phyiscal heads can not report more than 16 physical heads when moved to an IDE controller, the ATA spec allows a maximum of 16 heads - this is an artifact of virtualization. By supplying the logical geometies directly we are able to support such "exotic" disks. We will use fw_cfg to do just that. v2: Fix missing parenthesis check in "hd-geo-test: Add tests for lchs override" v3: * Rename fw_cfg key to "bios-geometry". * Remove "extendible" interface. * Add cpu_to_le32 fix as Laszlo suggested or big endian hosts * Fix last qtest commit - automatic docker tester for some reason does not have qemu-img set v4: * Change fw_cfg interface from mixed textual/binary to textual only v5: * Fix line > 80 chars in tests/hd-geo-test.c v6: * Small fixes for issues pointed by Max * (&conf->conf)->lcyls to conf->conf.lcyls and so on * Remove scsi_unrealize from everything other than scsi-hd * Add proper include to sysemu.h * scsi_device_unrealize() after scsi_device_purge_requests() Sam Eiderman (8): block: Refactor macros - fix tabbing block: Support providing LCHS from user bootdevice: Add interface to gather LCHS scsi: Propagate unrealize() callback to scsi-hd bootdevice: Gather LCHS from all relevant devices bootdevice: Refactor get_boot_devices_list bootdevice: FW_CFG interface for LCHS values hd-geo-test: Add tests for lchs override bootdevice.c | 148 ++++++++-- hw/block/virtio-blk.c | 6 + hw/ide/qdev.c | 7 +- hw/nvram/fw_cfg.c | 14 +- hw/scsi/scsi-bus.c | 16 ++ hw/scsi/scsi-disk.c | 12 + include/hw/block/block.h | 22 +- include/hw/scsi/scsi.h | 1 + include/sysemu/sysemu.h | 4 + tests/Makefile.include | 2 +- tests/hd-geo-test.c | 582 +++++++++++++++++++++++++++++++++++++++ 11 files changed, 773 insertions(+), 41 deletions(-) -- 2.23.0.187.g17f5b7556c-goog

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accessing BIOS settings
by Chris 😶🙃😵 Sept. 20, 2019

Sept. 20, 2019

Good day, A have a Samsung Series 3 Chromebox on which I installed SeaBIOS (version 181214_15:29-johnlewis.ie) a few years ago. I then installed Linux Mint, along with a GRUB. I would like to know how to access the BIOS settings, i.e. which key or combination of keys do I press at boot time? SeaBIOS displays "press ESC for boot menu" at boot time, but this just gives me the GRUB menu, not the BIOS settings. The main reason that I need to access the BIOS settings is because it is not prioritising booting from USB over the hard drive (which is SSD). Kind regards, Chris

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[QEMU] [PATCH v5 0/8] Add Qemu to SeaBIOS LCHS interface
by Sam Eiderman Aug. 25, 2019

Aug. 25, 2019

v1: Non-standard logical geometries break under QEMU. A virtual disk which contains an operating system which depends on logical geometries (consistent values being reported from BIOS INT13 AH=08) will most likely break under QEMU/SeaBIOS if it has non-standard logical geometries - for example 56 SPT (sectors per track). No matter what QEMU will guess - SeaBIOS, for large enough disks - will use LBA translation, which will report 63 SPT instead. In addition we can not enforce SeaBIOS to rely on phyiscal geometries at all. A virtio-blk-pci virtual disk with 255 phyiscal heads can not report more than 16 physical heads when moved to an IDE controller, the ATA spec allows a maximum of 16 heads - this is an artifact of virtualization. By supplying the logical geometies directly we are able to support such "exotic" disks. We will use fw_cfg to do just that. v2: Fix missing parenthesis check in "hd-geo-test: Add tests for lchs override" v3: * Rename fw_cfg key to "bios-geometry". * Remove "extendible" interface. * Add cpu_to_le32 fix as Laszlo suggested or big endian hosts * Fix last qtest commit - automatic docker tester for some reason does not have qemu-img set v4: * Change fw_cfg interface from mixed textual/binary to textual only v5: * Fix line > 80 chars in tests/hd-geo-test.c Sam Eiderman (8): block: Refactor macros - fix tabbing block: Support providing LCHS from user bootdevice: Add interface to gather LCHS scsi: Propagate unrealize() callback to scsi-hd bootdevice: Gather LCHS from all relevant devices bootdevice: Refactor get_boot_devices_list bootdevice: FW_CFG interface for LCHS values hd-geo-test: Add tests for lchs override bootdevice.c | 148 +++++++++--- hw/block/virtio-blk.c | 6 + hw/ide/qdev.c | 7 +- hw/nvram/fw_cfg.c | 14 +- hw/scsi/scsi-bus.c | 15 ++ hw/scsi/scsi-disk.c | 14 ++ include/hw/block/block.h | 22 +- include/hw/scsi/scsi.h | 1 + include/sysemu/sysemu.h | 4 + tests/Makefile.include | 2 +- tests/hd-geo-test.c | 582 +++++++++++++++++++++++++++++++++++++++++++++++ 11 files changed, 774 insertions(+), 41 deletions(-) -- 2.13.3

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[PATCH] Makefile: Build with -Wno-address-of-packed-member
by Kevin O'Connor Aug. 23, 2019

Aug. 23, 2019

Building with gcc v9 causes lots of warnings about pointers to packed variables. However, SeaBIOS is limited to x86 where unaligned reads/writes are supported by the cpu. So, disable that warning. Signed-off-by: Kevin O'Connor <kevin(a)koconnor.net> --- Makefile | 1 + 1 file changed, 1 insertion(+) diff --git a/Makefile b/Makefile index d16d1ae..5f7d537 100644 --- a/Makefile +++ b/Makefile @@ -68,6 +68,7 @@ COMMONCFLAGS += $(call cc-option,$(CC),-fno-pie,) COMMONCFLAGS += $(call cc-option,$(CC),-fno-stack-protector,) COMMONCFLAGS += $(call cc-option,$(CC),-fno-stack-protector-all,) COMMONCFLAGS += $(call cc-option,$(CC),-fstack-check=no,) +COMMONCFLAGS += $(call cc-option,$(CC),-Wno-address-of-packed-member,) COMMA := , CFLAGS32FLAT := $(COMMONCFLAGS) -DMODE16=0 -DMODESEGMENT=0 -- 2.21.0

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Regression with floppy drive controller
by Philippe Mathieu-Daudé Aug. 22, 2019

Aug. 22, 2019

[cross posting QEMU & SeaBIOS] Hello, I'v been looking at a QEMU bug report [1] which bisection resulted in a SeaBIOS commit: 4a6dbcea3e412fe12effa2f812f50dd7eae90955 is the first bad commit commit 4a6dbcea3e412fe12effa2f812f50dd7eae90955 Author: Nikolay Nikolov <nickysn(a)users.sourceforge.net> Date: Sun Feb 4 17:27:01 2018 +0200 floppy: Use timer_check() in floppy_wait_irq() Use timer_check() instead of using floppy_motor_counter in BDA for the timeout check in floppy_wait_irq(). The problem with using floppy_motor_counter was that, after it reaches 0, it immediately stops the floppy motors, which is not what is supposed to happen on real hardware. Instead, after a timeout (like in the end of every floppy operation, regardless of the result - success, timeout or error), the floppy motors must be kept spinning for additional 2 seconds (the FLOPPY_MOTOR_TICKS). So, now the floppy_motor_counter is initialized to 255 (the max value) in the beginning of the floppy operation. For IRQ timeouts, a different timeout is used, specified by the new FLOPPY_IRQ_TIMEOUT constant (currently set to 5 seconds - a fairly conservative value, but should work reliably on most floppies). After the floppy operation, floppy_drive_pio() resets the floppy_motor_counter to 2 seconds (FLOPPY_MOTOR_TICKS). This is also consistent with what other PC BIOSes do. This commit improve behavior with real hardware, so maybe QEMU is not modelling something or modelling it incorrectly? Regards, Phil. PD: How to reproduce: - Download Windows 98 SE floppy image from [2] - Run QEMU using the 'isapc' machine: $ qemu-system-i386 -M isapc \ -fda Windows\ 98\ Second\ Edition\ Boot.img SeaBIOS (version rel-1.11.0-11-g4a6dbce-prebuilt.qemu.org) Booting from Floppy... Boot failed: could not read the boot disk [1] https://bugs.launchpad.net/qemu/+bug/1840719 [2] https://winworldpc.com/download/417d71c2-ae18-c39a-11c3-a4e284a2c3a5

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How to build SeaBIOS as CSM for Tianocore?
by Rafael Send Aug. 20, 2019

Aug. 20, 2019

Hi all- I've found only vague references to doing this ( https://www.seabios.org/Build_overview#Build_as_a_UEFI_Compatibility_Suppor…) and no real guides / examples. Before I go on a wild goose chase, has anyone tried this before? I've tried the other way around, loading DUET from SeaBIOS, but all I get is a brief message that's too short to read properly (but it looks like it's loading memory locations, didn't see any errors), then I land back at SeaBIOS. Any pointers would be appreciated! Cheers, R

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