The option-rom puts all roms passed by this switch in the genroms directory,
through the fw_dir option. But as it turns out, not all roms should be placed there.
VGA roms are a of a different kind. They live in a different segment, and are scanned
first. This patch allows qemu to use external vgaroms such as sgabios, a rom for a serial
graphics adapter.
Without this patch, we lose all the initial BIOS output: until the option rom is initialized,
the only available vga rom is the default cirrus/vesa one.
We're also vulnerable to option rom enumeration order: if a vga oprom is initialized
before, say, gpxe, we are able to see its output in the adapter. If it is initialized
after, we miss it.
So I believe the proper solution is to allow users to specify that a rom belongs in vgaroms
directory instead.
Signed-off-by: Glauber Costa <glommer@xxxxxxxxxx>
CC: Gleb Natapov <gleb@xxxxxxxxxx>
---
hw/pc.c | 7 ++++++-
qemu-config.c | 3 +++
qemu-options.hx | 7 +++++--
sysemu.h | 1 +
vl.c | 1 +
5 files changed, 16 insertions(+), 3 deletions(-)
diff --git a/hw/pc.c b/hw/pc.c
index 8d351ba..736efbb 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -1055,7 +1055,12 @@ void pc_memory_init(ram_addr_t ram_size,
}
for (i = 0; i < nb_option_roms; i++) {
- rom_add_option(option_rom[i].name, option_rom[i].bootindex);
+ /* do it here, instead of in vl.c, to avoid cluttering that file with x86 material */
+ if (!option_rom[i].fw_dir) {
+ option_rom[i].fw_dir = "genroms";
+ }
+ rom_add_file(option_rom[i].name, option_rom[i].fw_dir, 0,
+ option_rom[i].bootindex);
}
}
diff --git a/qemu-config.c b/qemu-config.c
index 6d9c238..97b8515 100644
--- a/qemu-config.c
+++ b/qemu-config.c
@@ -450,6 +450,9 @@ QemuOptsList qemu_option_rom_opts = {
}, {
.name = "romfile",
.type = QEMU_OPT_STRING,
+ }, {
+ .name = "fw_dir",
+ .type = QEMU_OPT_STRING,
},
{ /* end if list */ }
},
diff --git a/qemu-options.hx b/qemu-options.hx
index 96927cc..d9eec62 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -2079,10 +2079,10 @@ to cope with initialization race conditions.
ETEXI
DEF("option-rom", HAS_ARG, QEMU_OPTION_option_rom, \
- "-option-rom rom[,bootindex=idx] load a file, rom, into the option ROM space\n",
+ "-option-rom rom[,bootindex=idx][,fw_dir=dir] load a file, rom, into the option ROM space\n",
QEMU_ARCH_ALL)
STEXI
-@item -option-rom @var{file}[,bootindex=@var{bootindex}]
+@item -option-rom @var{file}[,bootindex=@var{bootindex}][,fw_dir=@var{dir}]
@findex -option-rom
Load the contents of @var{file} as an option ROM.
This option is useful to load things like EtherBoot.
@@ -2091,6 +2091,9 @@ This option is useful to load things like EtherBoot.
@item bootindex=@var{bootindex}
Defines which boot index the option rom will be given in boot entry vectors,
allowing fine-grained selection of devices boot order.
+@item fw_dir=@var{dir} (x86 only)
+Specify under which firmware directory entry this rom should live. Current
+allowed values are vgaroms and genroms (default).
@end table
ETEXI
diff --git a/sysemu.h b/sysemu.h
index 3f7e17e..2f8be32 100644
--- a/sysemu.h
+++ b/sysemu.h
@@ -160,6 +160,7 @@ extern uint64_t node_cpumask[MAX_NODES];
typedef struct QEMUOptionRom {
const char *name;
int32_t bootindex;
+ const char *fw_dir;
} QEMUOptionRom;
extern QEMUOptionRom option_rom[MAX_OPTION_ROMS];
extern int nb_option_roms;
diff --git a/vl.c b/vl.c
index 8bcf2ae..e1d7868 100644
--- a/vl.c
+++ b/vl.c
@@ -2675,6 +2675,7 @@ int main(int argc, char **argv, char **envp)
fprintf(stderr, "Option ROM file is not specified\n");
exit(1);
}
+ option_rom[nb_option_roms].fw_dir = qemu_opt_get(opts, "fw_dir");
nb_option_roms++;
break;
case QEMU_OPTION_semihosting:
--
1.7.4
--
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