Well, it seems nobody is interesting by installing SliTaz in dual boot with Windows 8 on a UEFI computer ;) What a pity... because I did it ! :-p I've recovered grubx64.efi and the modules I need from an ISO of welknown distro.
I did it but (there is always a but).
I first tested SliTaz Rolling Core-64 in Legacy mode to be sure I won't have any compability problems and it worked fine. Then I came back to UEFI mode and installed rEFInd and SliTaz. And now, SliTaz boots... in console mode.
Could it be possible that booting in UEFI on a 64-bit architecture computer requires 64-bit drivers? Does anyone know?
Here is my lspci -nn
output
00:00.0 Host bridge [0600]: Intel Corporation Atom Processor Z36xxx/Z37xxx Series SoC Transaction Register [8086:0f00] (rev 0e)
00:02.0 VGA compatible controller [0300]: Intel Corporation Atom Processor Z36xxx/Z37xxx Series Graphics & Display [8086:0f31] (rev 0e)
00:13.0 SATA controller [0106]: Intel Corporation Atom Processor E3800 Series SATA AHCI Controller [8086:0f23] (rev 0e)
00:14.0 USB controller [0c03]: Intel Corporation Atom Processor Z36xxx/Z37xxx Series USB xHCI [8086:0f35] (rev 0e)
00:1a.0 Encryption controller [1080]: Intel Corporation Atom Processor Z36xxx/Z37xxx Series Trusted Execution Engine [8086:0f18] (rev 0e)
00:1b.0 Audio device [0403]: Intel Corporation Atom Processor Z36xxx/Z37xxx Series High Definition Audio Controller [8086:0f04] (rev 0e)
00:1c.0 PCI bridge [0604]: Intel Corporation Atom Processor E3800 Series PCI Express Root Port 1 [8086:0f48] (rev 0e)
00:1c.1 PCI bridge [0604]: Intel Corporation Atom Processor E3800 Series PCI Express Root Port 2 [8086:0f4a] (rev 0e)
00:1c.2 PCI bridge [0604]: Intel Corporation Atom Processor E3800 Series PCI Express Root Port 3 [8086:0f4c] (rev 0e)
00:1d.0 USB controller [0c03]: Intel Corporation Atom Processor Z36xxx/Z37xxx Series USB EHCI [8086:0f34] (rev 0e)
00:1f.0 ISA bridge [0601]: Intel Corporation Atom Processor Z36xxx/Z37xxx Series Power Control Unit [8086:0f1c] (rev 0e)
00:1f.3 SMBus [0c05]: Intel Corporation Atom Processor E3800 Series SMBus Controller [8086:0f12] (rev 0e)
02:00.0 Network controller [0280]: Qualcomm Atheros QCA9565 / AR9565 Wireless Network Adapter [168c:0036] (rev 01)
03:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 0c)
I think I can say that our actual grub2-efi package is virtually unusable since it can only be used on 32-bit EFI computers :( . We'll really need a grub2-EFI-64bit if we want SliTaz to be compatible with new PCs.