@@ -21,6 +21,7 @@ static char loadparm_str[LOADPARM_LEN + 1] = { 0, 0, 0, 0, 0, 0, 0, 0, 0 };
QemuIplParameters qipl;
IplParameterBlock iplb __attribute__((__aligned__(PAGE_SIZE)));
static bool have_iplb;
+static uint16_t cutype;
LowCore const *lowcore; /* Yes, this *is* a pointer to address 0 */
#define LOADPARM_PROMPT "PROMPT "
@@ -58,6 +59,9 @@ unsigned int get_loadparm_index(void)
* subchannel information block (schib) with the connected subchannel's info.
* NOTE: The global variable blk_schid is updated to contain the subchannel
* information.
+ *
+ * If the caller gives dev_no=-1 then the user did not specify a boot device.
+ * In this case we'll just use the first potentially bootable device we find.
*/
static bool find_subch(int dev_no)
{
@@ -74,16 +78,33 @@ static bool find_subch(int dev_no)
continue;
}
- /* Skip net devices since no IPLB is created and therefore no
- * network bootloader has been loaded
- */
enable_subchannel(blk_schid);
- if (virtio_is_supported(blk_schid) &&
- virtio_get_device_type() == VIRTIO_ID_NET && dev_no < 0) {
- continue;
+ cutype = cu_type(blk_schid);
+
+ /* No specific devno given, just return 1st possibly bootable device */
+ if (dev_no < 0) {
+ switch (cutype) {
+ case CU_TYPE_VIRTIO:
+ if (virtio_is_supported(blk_schid)) {
+ /*
+ * Skip net devices since no IPLB is created and therefore
+ * no network bootloader has been loaded
+ */
+ if (virtio_get_device_type() != VIRTIO_ID_NET) {
+ return true;
+ }
+ }
+ continue;
+ case CU_TYPE_DASD_3990:
+ case CU_TYPE_DASD_2107:
+ return true;
+ default:
+ continue;
+ }
}
- if ((dev_no < 0) || (schib.pmcw.dev == dev_no)) {
+ /* Caller asked for a specific devno */
+ if (schib.pmcw.dev == dev_no) {
return true;
}
}
@@ -200,15 +221,12 @@ static void virtio_setup(void)
int main(void)
{
- uint16_t cutype;
-
sclp_setup();
css_setup();
boot_setup();
find_boot_device();
enable_subchannel(blk_schid);
- cutype = cu_type(blk_schid);
switch (cutype) {
case CU_TYPE_DASD_3990:
case CU_TYPE_DASD_2107:
When the user does not specify which device to boot from then we end up guessing. Instead of simply grabbing the first available device let's be a little bit smarter and only choose devices that might be bootable like disk, and not console devices. Signed-off-by: Jason J. Herne <jjherne@linux.ibm.com> --- pc-bios/s390-ccw/main.c | 38 ++++++++++++++++++++++++++++---------- 1 file changed, 28 insertions(+), 10 deletions(-)