From 35af89eb491a0741005e474626053266e6e635b7 Mon Sep 17 00:00:00 2001 From: David Gibson Date: Tue, 21 Nov 2006 11:37:37 +1100 Subject: [POWERPC] Cleanup zImage handling of kernel entry with flat device tree This makes 2 changes to clean up the flat device tree handling logic in the zImage wrapper. First, there were two callbacks from the dt_ops structure used for producing a final flat tree to pass to the kerne: dt_ops.ft_pack() which packed the flat tree (possibly a no-op) and dt_ops.ft_addr() which retreived the address of the final blob. Since they were only ever called together, this patch combines the two into a single new callback, dt_ops.finalize(). This new callback does whatever platform-dependent things are necessary to produce a final flat device tree blob, and returns the blob's addres. Second, the current logic calls the kernel with a flat device tree if one is build into the zImage wrapper, otherwise it boots the kernel with a PROM pointer, expecting the kernel to copy the OF device tree itself. This approach precludes the possibility of the platform wrapper code building a flat device tree from whatever platform-specific information firmware provides. Thus, this patch takes the more sensible approach of invoking the kernel with a flat tree if the dt_ops.finalize callback provides one (by whatever means). So, the dt_ops.finalize callback can be NULL, or can be a function which returns NULL. In either case, the zImage wrapper logic assumes that this is a platform with OF and invokes the kernel accordingly. Signed-off-by: David Gibson Signed-off-by: Paul Mackerras --- arch/powerpc/boot/main.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) (limited to 'arch/powerpc/boot/main.c') diff --git a/arch/powerpc/boot/main.c b/arch/powerpc/boot/main.c index 630a453e16f..6f6b50d238b 100644 --- a/arch/powerpc/boot/main.c +++ b/arch/powerpc/boot/main.c @@ -298,6 +298,7 @@ void start(unsigned long a1, unsigned long a2, void *promptr, void *sp) { kernel_entry_t kentry; char cmdline[COMMAND_LINE_SIZE]; + unsigned long ft_addr = 0; memset(__bss_start, 0, _end - __bss_start); memset(&platform_ops, 0, sizeof(platform_ops)); @@ -328,14 +329,20 @@ void start(unsigned long a1, unsigned long a2, void *promptr, void *sp) set_cmdline(cmdline); } + printf("Finalizing device tree..."); + if (dt_ops.finalize) + ft_addr = dt_ops.finalize(); + if (ft_addr) + printf(" flat tree at 0x%lx\n\r", ft_addr); + else + printf(" using OF tree (promptr=%p)\n\r", promptr); + if (console_ops.close) console_ops.close(); kentry = (kernel_entry_t) vmlinux.addr; - if (_dtb_end > _dtb_start) { - dt_ops.ft_pack(); - kentry(dt_ops.ft_addr(), 0, NULL); - } + if (ft_addr) + kentry(ft_addr, 0, NULL); else /* XXX initrd addr/size should be passed in properties */ kentry(initrd.addr, initrd.size, promptr); -- cgit v1.2.3