[PATCH] doc: Provide solution for qemuarm-stretch boot in QEMU

[Alexander Smirnov <asmirnov@ilbers.de>]

The QEMU 2.8+ should be used to run qemuarm-stretch image locally. Otherwise
there will be the following boot issue:

 ------------[ cut here ]------------
 WARNING: CPU: 0 PID: 69 at /build/linux-twocCo/linux-4.9.51/drivers/irqchip/irq-gic-common.c:80 gic_configure_irq+0xb4/0xb8
 Modules linked in: virtio_blk(+) virtio_mmio virtio_ring virtio
 CPU: 0 PID: 69 Comm: systemd-udevd Not tainted 4.9.0-4-armmp #1 Debian 4.9.51-1
 Hardware name: Generic DT based system
 [<c0114db8>] (unwind_backtrace) from [<c010ef30>] (show_stack+0x20/0x24)
 [<c010ef30>] (show_stack) from [<c040debc>] (dump_stack+0x90/0xa4)
 [<c040debc>] (dump_stack) from [<c014c368>] (__warn+0xf8/0x110)
 [<c014c368>] (__warn) from [<c014c498>] (warn_slowpath_null+0x30/0x38)
 [<c014c498>] (warn_slowpath_null) from [<c0440be4>] (gic_configure_irq+0xb4/0xb8)
 [<c0440be4>] (gic_configure_irq) from [<c043fcbc>] (gic_set_type+0x6c/0x78)
 [<c043fcbc>] (gic_set_type) from [<c01b5c68>] (__irq_set_trigger+0x6c/0x1b0)
 [<c01b5c68>] (__irq_set_trigger) from [<c01b6328>] (__setup_irq+0x57c/0x644)
 [<c01b6328>] (__setup_irq) from [<c01b65c0>] (request_threaded_irq+0xfc/0x19c)
 [<c01b65c0>] (request_threaded_irq) from [<bf015af8>] (vm_find_vqs+0x58/0x388 [virtio_mmio])
 [<bf015af8>] (vm_find_vqs [virtio_mmio]) from [<bf034498>] (init_vq+0x184/0x294 [virtio_blk])
 [<bf034498>] (init_vq [virtio_blk]) from [<bf0350e0>] (virtblk_probe+0xdc/0x73c [virtio_blk])
 [<bf0350e0>] (virtblk_probe [virtio_blk]) from [<bf003950>] (virtio_dev_probe+0x230/0x30c [virtio])
 [<bf003950>] (virtio_dev_probe [virtio]) from [<c0587f2c>] (driver_probe_device+0x230/0x42c)
 [<c0587f2c>] (driver_probe_device) from [<c0588228>] (__driver_attach+0x100/0x10c)
 [<c0588228>] (__driver_attach) from [<c0585950>] (bus_for_each_dev+0x8c/0xd0)
 [<c0585950>] (bus_for_each_dev) from [<c058761c>] (driver_attach+0x2c/0x30)
 [<c058761c>] (driver_attach) from [<c058704c>] (bus_add_driver+0x16c/0x26c)
 [<c058704c>] (bus_add_driver) from [<c0588d60>] (driver_register+0x88/0x104)
 [<c0588d60>] (driver_register) from [<bf003668>] (register_virtio_driver+0x38/0x4c [virtio])
 [<bf003668>] (register_virtio_driver [virtio]) from [<bf038074>] (init+0x74/0xa4 [virtio_blk])
 [<bf038074>] (init [virtio_blk]) from [<c0102108>] (do_one_initcall+0x64/0x1a0)
 [<c0102108>] (do_one_initcall) from [<c026dbcc>] (do_init_module+0x74/0x3d0)
 [<c026dbcc>] (do_init_module) from [<c01e9a54>] (load_module+0x1f08/0x2570)
 [<c01e9a54>] (load_module) from [<c01ea378>] (SyS_finit_module+0xdc/0x110)
 [<c01ea378>] (SyS_finit_module) from [<c0109e60>] (ret_fast_syscall+0x0/0x3c)
 ---[ end trace abde4ea52e9f6bd2 ]---
 genirq: Setting trigger mode 1 for irq 51 failed (gic_set_type+0x0/0x78)
 virtio_blk: probe of virtio0 failed with error -22

Signed-off-by: Alexander Smirnov <asmirnov@ilbers.de>
---
 README.md          | 3 ++-
 doc/user_manual.md | 2 ++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 15a2a60..78c0332 100644
--- a/README.md
+++ b/README.md
@@ -42,9 +42,10 @@ Commercial support: info@ilbers.de
 
 Built on:
 * Debian 8.2
+* Debian 8.7
 
 Tested on:
-* QEMU 1.1.2+dfsg-6a+deb7u12
+* QEMU 1:2.8+dfsg-3~bpo8+1
 * Raspberry Pi 1 Model B rev 2
 
 # Credits
diff --git a/doc/user_manual.md b/doc/user_manual.md
index bbcc007..14657e3 100644
--- a/doc/user_manual.md
+++ b/doc/user_manual.md
@@ -70,6 +70,8 @@ Notes:
 
 * BitBake requires Python 3.4+.
 * The python3 package is required for the correct `alternatives` setting.
+* QEMU 2.8+ is required to run Stretch images locally in QEMU. This version is available in Stretch and Jessie backports apts.
+* e2fsprogs v1.42- required for building Wheezy images.
 
 ### Setup Sudo
 
-- 
2.1.4