| Commit message (Collapse) | Author | Age | Files | Lines | |
|---|---|---|---|---|---|
| * | x86: OLPC: have prom_early_alloc BUG rather than return NULL | Andres Salomon | 2011-03-02 | 1 | -2/+1 |
| | | | | | | | | ..similar to what sparc's prom_early_alloc does. Signed-off-by: Andres Salomon <dilinger@queued.net> Signed-off-by: Grant Likely <grant.likely@secretlab.ca> | ||||
| * | x86, olpc: Speed up device tree creation during boot | Andres Salomon | 2010-12-16 | 1 | -5/+23 |
| | | | | | | | | | | | | | | | | | | | | | | | Calling alloc_bootmem() for tiny chunks of memory over and over is really slow; on an XO-1, it caused the time between when the kernel started booting and when the display came alive (post-lxfb probe) to increase to 44s. This patch optimizes the prom_early_alloc function by calling alloc_bootmem for 4k-sized blocks of memory, and handing out chunks of that to callers. With this patch, the time between kernel load and display initialization decreased to 23s. If there's a better way to do this early in the boot process, please let me know. (Note: increasing the chunk size to 16k didn't noticably affect boot time, and wasted 9k.) v4: clarify comment, requested by hpa v3: fix wasted memory buglet found by Milton Miller, and style fix. v2: reorder prom_early_alloc as suggested by Grant. Signed-off-by: Andres Salomon <dilinger@queued.net> LKML-Reference: <20101129153951.74202a84@queued.net> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com> | ||||
| * | x86, olpc: Add OLPC device-tree support | Andres Salomon | 2010-12-16 | 1 | -0/+165 |
| Make use of PROC_DEVICETREE to export the tree, and sparc's PROMTREE code to call into OLPC's Open Firmware to build the tree. v5: fix buglet with root node check (introduced in v4) v4: address some minor style issues pointed out by Grant, and explicitly cast negative phandle checks to s32. v3: rename olpc_prom to olpc_dt - rework Kconfig entries - drop devtree build hook from proc, instead adding a call to x86's paging_init (similarly to how sparc64 does it) - switch allocation from using slab to alloc_bootmem. this allows the DT to be built earlier during boot (during setup_arch); the downside is that there are some 1200 bootmem reservations that are done during boot. Not ideal.. - add a helper olpc_ofw_is_installed function to test for the existence and successful detection of OLPC's OFW. Signed-off-by: Andres Salomon <dilinger@queued.net> LKML-Reference: <20101116220952.26526a80@queued.net> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com> | |||||
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